[Tarantool-patches] [PATCH v5 4/5] sql: remove control pragmas

Mergen Imeev imeevma at tarantool.org
Sun Dec 29 15:59:47 MSK 2019


On Sun, Dec 29, 2019 at 03:44:48PM +0300, Mergen Imeev wrote:
> Hi! Thank you very much for review and fixes! I applied
> your diff. New patch below.
> 
> Also, I removed new line from patch 'sql: remove PRAGMA
> "short_column_names"':
> diff --git a/src/box/sql/select.c b/src/box/sql/select.c
> index 473ee11..5e3d66f 100644
> --- a/src/box/sql/select.c
> +++ b/src/box/sql/select.c
> @@ -1824,7 +1824,6 @@ generate_column_metadata(struct Parse *pParse, struct SrcList *pTabList,
>  			assert(iCol >= 0 && iCol < (int)space_def->field_count);
>  			zCol = space_def->fields[iCol].name;
>  			const char *name = NULL;
> -
>  			if (pEList->a[i].zName != NULL) {
>  				name = pEList->a[i].zName;
>  			} else {
> 
> 
Also i fixed this:

diff --git a/src/box/sql/select.c b/src/box/sql/select.c
index 5e3d66f..15f1850 100644
--- a/src/box/sql/select.c
+++ b/src/box/sql/select.c
@@ -1827,7 +1827,7 @@ generate_column_metadata(struct Parse *pParse, struct SrcList *pTabList,
 			if (pEList->a[i].zName != NULL) {
 				name = pEList->a[i].zName;
 			} else {
-				if (pParse->sql_flags & SQL_FullColNames) {
+				if (pParse->sql_flags & SQL_FullColNames != 0) {
 					name = tt_sprintf("%s.%s",
 							  space_def->name,
 							  zCol);


> On Fri, Dec 27, 2019 at 06:26:39PM +0300, Vladislav Shpilevoy wrote:
> > Hi! Thanks for the patch!
> > 
> > I've pushed my review fixes on top of this commit. See it below
> > and on the branch. If you agree, then squash. Otherwise lets
> > discuss.
> > 
> > ================================================================================
> > 
> > commit 66b927c57c84b49ef2244efb49c0986928fb8e2b
> > Author: Vladislav Shpilevoy <v.shpilevoy at tarantool.org>
> > Date:   Fri Dec 27 17:32:35 2019 +0300
> > 
> >     Review fixes 4/5
> > 
> > diff --git a/src/box/sql/sqlInt.h b/src/box/sql/sqlInt.h
> > index d859d6380..f4d6e52cd 100644
> > --- a/src/box/sql/sqlInt.h
> > +++ b/src/box/sql/sqlInt.h
> > @@ -3771,7 +3771,6 @@ sql_space_def_check_format(const struct space_def *space_def);
> >  void sqlDetach(Parse *, Expr *);
> >  int sqlAtoF(const char *z, double *, int);
> >  int sqlGetInt32(const char *, int *);
> > -int sqlAtoi(const char *);
> >  
> >  /**
> >   * Return number of symbols in the given string.
> > @@ -3959,8 +3958,6 @@ int
> >  sql_rem_int(int64_t lhs, bool is_lhs_neg, int64_t rhs, bool is_rhs_neg,
> >  	    int64_t *res, bool *is_res_neg);
> >  
> > -u8 sqlGetBoolean(const char *z, u8);
> > -
> >  const void *sqlValueText(sql_value *);
> >  int sqlValueBytes(sql_value *);
> >  void sqlValueSetStr(sql_value *, int, const void *,
> > diff --git a/src/box/sql/util.c b/src/box/sql/util.c
> > index 0e115accf..f908e9ced 100644
> > --- a/src/box/sql/util.c
> > +++ b/src/box/sql/util.c
> > @@ -495,8 +495,6 @@ sql_atoi64(const char *z, int64_t *val, bool *is_neg, int length)
> >   * This routine accepts both decimal and hexadecimal notation for integers.
> >   *
> >   * Any non-numeric characters that following zNum are ignored.
> > - * This is different from sqlAtoi64() which requires the
> > - * input number to be zero-terminated.
> >   */
> >  int
> >  sqlGetInt32(const char *zNum, int *pValue)
> > @@ -553,19 +551,6 @@ sqlGetInt32(const char *zNum, int *pValue)
> >  	return 1;
> >  }
> >  
> > -/*
> > - * Return a 32-bit integer value extracted from a string.  If the
> > - * string is not an integer, just return 0.
> > - */
> > -int
> > -sqlAtoi(const char *z)
> > -{
> > -	int x = 0;
> > -	if (z)
> > -		sqlGetInt32(z, &x);
> > -	return x;
> > -}
> > -
> >  /*
> >   * The variable-length integer encoding is as follows:
> >   *
> > diff --git a/src/box/sql/vdbe.c b/src/box/sql/vdbe.c
> > index 8e12c37a0..c5c0a9790 100644
> > --- a/src/box/sql/vdbe.c
> > +++ b/src/box/sql/vdbe.c
> > @@ -4778,8 +4778,8 @@ case OP_Program: {        /* jump */
> >  
> >  	/* If the p5 flag is clear, then recursive invocation of triggers is
> >  	 * disabled for backwards compatibility (p5 is set if this sub-program
> > -	 * is really a trigger, not a foreign key action, and the flag set
> > -	 * and cleared by the "PRAGMA recursive_triggers" command is clear).
> > +	 * is really a trigger, not a foreign key action, and the setting
> > +	 * 'recursive_triggers' is not set).
> >  	 *
> >  	 * It is recursive invocation of triggers, at the SQL level, that is
> >  	 * disabled. In some cases a single trigger may generate more than one
> > diff --git a/src/box/sql/vdbe.h b/src/box/sql/vdbe.h
> > index 1e585d89d..0f2703091 100644
> > --- a/src/box/sql/vdbe.h
> > +++ b/src/box/sql/vdbe.h
> > @@ -199,11 +199,6 @@ int sqlVdbeAddOp4(Vdbe *, int, int, int, int, const char *zP4, int);
> >  int sqlVdbeAddOp4Dup8(Vdbe *, int, int, int, int, const u8 *, int);
> >  int sqlVdbeAddOp4Int(Vdbe *, int, int, int, int, int);
> >  void sqlVdbeEndCoroutine(Vdbe *, int);
> > -#if defined(SQL_DEBUG) && !defined(SQL_TEST_REALLOC_STRESS)
> > -void sqlVdbeVerifyNoResultRow(Vdbe * p);
> > -#else
> > -#define sqlVdbeVerifyNoResultRow(A)
> > -#endif
> >  void sqlVdbeChangeOpcode(Vdbe *, u32 addr, u8);
> >  void sqlVdbeChangeP1(Vdbe *, u32 addr, int P1);
> >  void sqlVdbeChangeP2(Vdbe *, u32 addr, int P2);
> > diff --git a/src/box/sql/vdbeaux.c b/src/box/sql/vdbeaux.c
> > index 5b4bc0182..43e0566bb 100644
> > --- a/src/box/sql/vdbeaux.c
> > +++ b/src/box/sql/vdbeaux.c
> > @@ -533,24 +533,6 @@ sqlVdbeCurrentAddr(Vdbe * p)
> >  	return p->nOp;
> >  }
> >  
> > -/*
> > - * Verify that the VM passed as the only argument does not contain
> > - * an OP_ResultRow opcode. Fail an assert() if it does. This is used
> > - * by code in pragma.c to ensure that the implementation of certain
> > - * pragmas comports with the flags specified in the mkpragmatab.tcl
> > - * script.
> > - */
> > -#if defined(SQL_DEBUG) && !defined(SQL_TEST_REALLOC_STRESS)
> > -void
> > -sqlVdbeVerifyNoResultRow(Vdbe * p)
> > -{
> > -	int i;
> > -	for (i = 0; i < p->nOp; i++) {
> > -		assert(p->aOp[i].opcode != OP_ResultRow);
> > -	}
> > -}
> > -#endif
> > -
> >  /*
> >   * This function returns a pointer to the array of opcodes associated with
> >   * the Vdbe passed as the first argument. It is the callers responsibility
> > diff --git a/test/sql-tap/lua/sqltester.lua b/test/sql-tap/lua/sqltester.lua
> > index de5ef6b8b..9b0218e63 100644
> > --- a/test/sql-tap/lua/sqltester.lua
> > +++ b/test/sql-tap/lua/sqltester.lua
> > @@ -413,7 +413,7 @@ box.cfg{
> >  }
> >  
> >  local engine = test_run and test_run:get_cfg('engine') or 'memtx'
> > -_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
> > +box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
> >  
> >  function test.engine(self)
> >      return engine
> > diff --git a/test/sql-tap/select1.test.lua b/test/sql-tap/select1.test.lua
> > index f309e1e73..bea5b9c7c 100755
> > --- a/test/sql-tap/select1.test.lua
> > +++ b/test/sql-tap/select1.test.lua
> > @@ -2,6 +2,12 @@
> >  test = require("sqltester")
> >  test:plan(173)
> >  
> > +function set_full_column_names(value)
> > +    box.space._session_settings:update('sql_full_column_names', {
> > +        {'=', 2, value}
> > +    })
> > +end
> > +
> >  --!./tcltestrunner.lua
> >  -- ["set","testdir",[["file","dirname",["argv0"]]]]
> >  -- ["source",[["testdir"],"\/tester.tcl"]]
> > @@ -916,7 +922,7 @@ test:do_catchsql2_test(
> >  test:do_test(
> >      "select1-6.1.1",
> >      function()
> > -        box.space._session_settings:update('sql_full_column_names', {{'=', 2, true}})
> > +        set_full_column_names(true)
> >          return test:catchsql2 "SELECT f1 FROM test1 ORDER BY f2"
> >      end, {
> >          -- <select1-6.1.1>
> > @@ -952,7 +958,7 @@ test:do_test(
> >              msg = test:execsql2 "SELECT DISTINCT * FROM test1 WHERE f1==11"
> >              end)
> >          v = v == true and {0} or {1} 
> > -        box.space._session_settings:update('sql_full_column_names', {{'=', 2, false}})
> > +        set_full_column_names(false)
> >          return table.insert(v,msg) or v
> >      end, {
> >          -- <select1-6.1.4>
> > @@ -1043,13 +1049,13 @@ test:do_catchsql2_test(
> >  test:do_test(
> >      "select1-6.5.1",
> >      function()
> > -        box.space._session_settings:update('sql_full_column_names', {{'=', 2, true}})
> > +        set_full_column_names(true)
> >          local msg
> >          v = pcall( function ()
> >                  msg = test:execsql2 "SELECT test1.f1+F2 FROM test1 ORDER BY f2"
> >              end)
> >          v = v == true and {0} or {1}
> > -        box.space._session_settings:update('sql_full_column_names', {{'=', 2, false}})
> > +        set_full_column_names(false)
> >          return table.insert(v,msg) or v
> >      end, {
> >          -- <select1-6.5.1>
> > @@ -1123,7 +1129,7 @@ test:do_catchsql2_test(
> >  test:do_test(
> >      "select1-6.9.3",
> >      function()
> > -        box.space._session_settings:update('sql_full_column_names', {{'=', 2, false}})
> > +        set_full_column_names(false)
> >          return test:execsql2 [[
> >              SELECT test1 . f1, test1 . f2 FROM test1 LIMIT 1
> >          ]]
> > @@ -1136,7 +1142,7 @@ test:do_test(
> >  test:do_test(
> >      "select1-6.9.4",
> >      function()
> > -        box.space._session_settings:update('sql_full_column_names', {{'=', 2, true}})
> > +        set_full_column_names(true)
> >          return test:execsql2 [[
> >              SELECT test1 . f1, test1 . f2 FROM test1 LIMIT 1
> >          ]]
> > @@ -1149,7 +1155,7 @@ test:do_test(
> >  test:do_test(
> >      "select1-6.9.5",
> >      function()
> > -        box.space._session_settings:update('sql_full_column_names', {{'=', 2, true}})
> > +        set_full_column_names(true)
> >          return test:execsql2 [[
> >              SELECT 123.45;
> >          ]]
> > @@ -1228,7 +1234,7 @@ test:do_execsql2_test(
> >  test:do_test(
> >      "select1-6.9.11",
> >      function()
> > -        box.space._session_settings:update('sql_full_column_names', {{'=', 2, true}})
> > +        set_full_column_names(true)
> >          return test:execsql2 [[
> >              SELECT a.f1, b.f2 FROM test1 a, test1 b LIMIT 1
> >          ]]
> > @@ -1251,7 +1257,7 @@ test:do_execsql2_test(
> >  test:do_test(
> >      "select1-6.9.13",
> >      function()
> > -        box.space._session_settings:update('sql_full_column_names', {{'=', 2, false}})
> > +        set_full_column_names(false)
> >          return test:execsql2 [[
> >              SELECT a.f1, b.f1 FROM test1 a, test1 b LIMIT 1
> >          ]]
> > @@ -1274,7 +1280,7 @@ test:do_execsql2_test(
> >  test:do_test(
> >      "select1-6.9.15",
> >      function()
> > -        box.space._session_settings:update('sql_full_column_names', {{'=', 2, true}})
> > +        set_full_column_names(true)
> >          return test:execsql2 [[
> >              SELECT a.f1, b.f1 FROM test1 a, test1 b LIMIT 1
> >          ]]
> > @@ -1294,7 +1300,7 @@ test:do_execsql2_test(
> >          -- </select1-6.9.16>
> >      })
> >  
> > -box.space._session_settings:update('sql_full_column_names', {{'=', 2, false}})
> > +set_full_column_names(false)
> >  test:do_catchsql2_test(
> >          "select1-6.10",
> >          [[
> > diff --git a/test/sql/transitive-transactions.result b/test/sql/transitive-transactions.result
> > index e5868d7b0..91c35a309 100644
> > --- a/test/sql/transitive-transactions.result
> > +++ b/test/sql/transitive-transactions.result
> > @@ -87,7 +87,7 @@ box.space.PARENT:select();
> >  ---
> >  - - [1, 1]
> >  ...
> > --- Make sure that 'PRAGMA defer_foreign_keys' works.
> > +-- Make sure that setting 'defer_foreign_keys' works.
> >  --
> >  box.execute('DROP TABLE child;')
> >  box.execute('CREATE TABLE child(id INT PRIMARY KEY, x INT REFERENCES parent(y))')
> > diff --git a/test/sql/transitive-transactions.test.lua b/test/sql/transitive-transactions.test.lua
> > index f4df716c3..5565de7fe 100644
> > --- a/test/sql/transitive-transactions.test.lua
> > +++ b/test/sql/transitive-transactions.test.lua
> > @@ -45,7 +45,7 @@ fk_violation_3();
> >  box.space.CHILD:select();
> >  box.space.PARENT:select();
> >  
> > --- Make sure that 'PRAGMA defer_foreign_keys' works.
> > +-- Make sure that setting 'defer_foreign_keys' works.
> >  --
> >  box.execute('DROP TABLE child;')
> >  box.execute('CREATE TABLE child(id INT PRIMARY KEY, x INT REFERENCES parent(y))')
> 
> New patch:
> 
> 
> From d80b809cff85a3b684dd67f8cf76b942dcc6b137 Mon Sep 17 00:00:00 2001
> From: Mergen Imeev <imeevma at gmail.com>
> Date: Fri, 27 Dec 2019 11:29:41 +0300
> Subject: [PATCH] sql: remove control pragmas
> 
> This patch removes control pragmas. They are not needed now, after
> the introduction of the _session_settings system space.
> 
> Closes #4511
> 
> diff --git a/src/box/sql/pragma.c b/src/box/sql/pragma.c
> index a8353ba..ee1348c 100644
> --- a/src/box/sql/pragma.c
> +++ b/src/box/sql/pragma.c
> @@ -62,56 +62,6 @@
>  #include "pragma.h"
>  #include "tarantoolInt.h"
>  
> -/*
> - * Interpret the given string as a safety level.  Return 0 for OFF,
> - * 1 for ON or NORMAL, 2 for FULL, and 3 for EXTRA.  Return 1 for an empty or
> - * unrecognized string argument.  The FULL and EXTRA option is disallowed
> - * if the omitFull parameter it 1.
> - *
> - * Note that the values returned are one less that the values that
> - * should be passed into sqlBtreeSetSafetyLevel().  The is done
> - * to support legacy SQL code.  The safety level used to be boolean
> - * and older scripts may have used numbers 0 for OFF and 1 for ON.
> - */
> -static u8
> -getSafetyLevel(const char *z, int omitFull, u8 dflt)
> -{
> -	/* 123456789 123456789 123 */
> -	static const char zText[] = "onoffalseyestruextrafull";
> -	static const u8 iOffset[] = { 0, 1, 2, 4, 9, 12, 15, 20 };
> -	static const u8 iLength[] = { 2, 2, 3, 5, 3, 4, 5, 4 };
> -	static const u8 iValue[] = { 1, 0, 0, 0, 1, 1, 3, 2 };
> -	/* on no off false yes true extra full */
> -	int i, n;
> -	if (sqlIsdigit(*z)) {
> -		return (u8) sqlAtoi(z);
> -	}
> -	n = sqlStrlen30(z);
> -	for (i = 0; i < ArraySize(iLength); i++) {
> -		if (iLength[i] == n
> -		    && sqlStrNICmp(&zText[iOffset[i]], z, n) == 0
> -		    && (!omitFull || iValue[i] <= 1)
> -		    ) {
> -			return iValue[i];
> -		}
> -	}
> -	return dflt;
> -}
> -
> -/*
> - * Interpret the given string as a boolean value.
> - */
> -u8
> -sqlGetBoolean(const char *z, u8 dflt)
> -{
> -	return getSafetyLevel(z, 1, dflt) != 0;
> -}
> -
> -/* The sqlGetBoolean() function is used by other modules but the
> - * remainder of this file is specific to PRAGMA processing.  So omit
> - * the rest of the file if PRAGMAs are omitted from the build.
> - */
> -
>  /** Set result column names and types for a pragma. */
>  static void
>  vdbe_set_pragma_result_columns(struct Vdbe *v, const struct PragmaName *pragma)
> @@ -126,17 +76,6 @@ vdbe_set_pragma_result_columns(struct Vdbe *v, const struct PragmaName *pragma)
>  }
>  
>  /*
> - * Generate code to return a single integer value.
> - */
> -static void
> -returnSingleInt(Vdbe * v, i64 value)
> -{
> -	sqlVdbeAddOp4Dup8(v, OP_Int64, 0, 1, 0, (const u8 *)&value,
> -			  value < 0 ? P4_INT64 : P4_UINT64);
> -	sqlVdbeAddOp2(v, OP_ResultRow, 1, 1);
> -}
> -
> -/*
>   * Locate a pragma in the aPragmaName[] array.
>   */
>  static const PragmaName *
> @@ -159,53 +98,6 @@ pragmaLocate(const char *zName)
>  	return lwr > upr ? 0 : &aPragmaName[mid];
>  }
>  
> -static void
> -vdbe_emit_pragma_status(struct Parse *parse)
> -{
> -	struct Vdbe *v = sqlGetVdbe(parse);
> -	struct session *user_session = current_session();
> -
> -	sqlVdbeSetNumCols(v, 2);
> -	vdbe_metadata_set_col_name(v, 0, "pragma_name");
> -	vdbe_metadata_set_col_type(v, 0, "text");
> -	vdbe_metadata_set_col_name(v, 1, "pragma_value");
> -	vdbe_metadata_set_col_type(v, 1, "integer");
> -
> -	parse->nMem = 2;
> -	for (int i = 0; i < ArraySize(aPragmaName); ++i) {
> -		if (aPragmaName[i].ePragTyp != PragTyp_FLAG)
> -			continue;
> -		sqlVdbeAddOp4(v, OP_String8, 0, 1, 0, aPragmaName[i].zName, 0);
> -		int val = (user_session->sql_flags & aPragmaName[i].iArg) != 0;
> -		sqlVdbeAddOp2(v, OP_Integer, val, 2);
> -		sqlVdbeAddOp2(v, OP_ResultRow, 1, 2);
> -	}
> -}
> -
> -/**
> - * Set tarantool backend default engine for SQL interface.
> - * @param engine_name to set default.
> - * @retval -1 on error.
> - * @retval 0 on success.
> - */
> -static int
> -sql_default_engine_set(const char *engine_name)
> -{
> -	if (engine_name == NULL) {
> -		diag_set(ClientError, ER_ILLEGAL_PARAMS,
> -			 "'sql_default_engine' was not specified");
> -		return -1;
> -	}
> -	enum sql_storage_engine engine =
> -		STR2ENUM(sql_storage_engine, engine_name);
> -	if (engine == sql_storage_engine_MAX) {
> -		diag_set(ClientError, ER_NO_SUCH_ENGINE, engine_name);
> -		return -1;
> -	}
> -	current_session()->sql_default_engine = engine;
> -	return 0;
> -}
> -
>  /**
>   * This function handles PRAGMA TABLE_INFO(<table>).
>   *
> @@ -371,22 +263,6 @@ sql_pragma_index_list(struct Parse *parse, const char *tbl_name)
>  }
>  
>  /*
> - * @brief Check whether the specified token is a string or ID.
> - * @param token - token to be examined
> - * @return true - if the token value is enclosed into quotes (')
> - * @return false in other cases
> - * The empty value is considered to be a string.
> - */
> -static bool
> -token_is_string(const struct Token* token)
> -{
> -	if (!token || token->n == 0)
> -		return true;
> -	return token->n >= 2 && token->z[0] == '\'' &&
> -	       token->z[token->n - 1] == '\'';
> -}
> -
> -/*
>   * Process a pragma statement.
>   *
>   * Pragmas are of this form:
> @@ -414,17 +290,12 @@ sqlPragma(Parse * pParse, Token * pId,	/* First part of [schema.]id field */
>  	sql *db = pParse->db;	/* The database connection */
>  	Vdbe *v = sqlGetVdbe(pParse);	/* Prepared statement */
>  	const PragmaName *pPragma;	/* The pragma */
> -	struct session *user_session = current_session();
>  
>  	if (v == 0)
>  		return;
>  	sqlVdbeRunOnlyOnce(v);
>  	pParse->nMem = 2;
>  
> -	if (pId == NULL) {
> -		vdbe_emit_pragma_status(pParse);
> -		return;
> -	}
>  	zLeft = sql_name_from_token(db, pId);
>  	if (zLeft == NULL) {
>  		pParse->is_aborted = true;
> @@ -454,38 +325,10 @@ sqlPragma(Parse * pParse, Token * pId,	/* First part of [schema.]id field */
>  		goto pragma_out;
>  	}
>  	/* Register the result column names for pragmas that return results */
> -	if ((pPragma->mPragFlg & PragFlg_NoColumns) == 0 &&
> -	    ((pPragma->mPragFlg & PragFlg_NoColumns1) == 0 || zRight == NULL))
> -		vdbe_set_pragma_result_columns(v, pPragma);
> +	vdbe_set_pragma_result_columns(v, pPragma);
>  	/* Jump to the appropriate pragma handler */
>  	switch (pPragma->ePragTyp) {
>  
> -	case PragTyp_FLAG:{
> -		if (zRight == NULL) {
> -			vdbe_set_pragma_result_columns(v, pPragma);
> -			returnSingleInt(v, (user_session->sql_flags &
> -					    pPragma->iArg) != 0);
> -		} else {
> -			/* Mask of bits to set or clear. */
> -			int mask = pPragma->iArg;
> -			bool is_pragma_set = sqlGetBoolean(zRight, 0);
> -
> -			if (is_pragma_set)
> -				user_session->sql_flags |= mask;
> -			else
> -				user_session->sql_flags &= ~mask;
> -#if defined(SQL_DEBUG)
> -			if (mask == PARSER_TRACE_FLAG) {
> -				if (is_pragma_set)
> -					sqlParserTrace(stdout, "parser: ");
> -				else
> -					sqlParserTrace(0, 0);
> -			}
> -#endif
> -		}
> -		break;
> -	}
> -
>  	case PragTyp_TABLE_INFO:
>  		sql_pragma_table_info(pParse, zRight);
>  		break;
> @@ -563,43 +406,10 @@ sqlPragma(Parse * pParse, Token * pId,	/* First part of [schema.]id field */
>  		break;
>  	}
>  
> -	case PragTyp_DEFAULT_ENGINE: {
> -		if (!token_is_string(pValue)) {
> -			diag_set(ClientError, ER_ILLEGAL_PARAMS,
> -				 "string value is expected");
> -			pParse->is_aborted = true;
> -			goto pragma_out;
> -		}
> -		if (zRight == NULL) {
> -			const char *engine_name =
> -				sql_storage_engine_strs[current_session()->
> -							sql_default_engine];
> -			sqlVdbeLoadString(v, 1, engine_name);
> -			sqlVdbeAddOp2(v, OP_ResultRow, 1, 1);
> -		} else {
> -			if (sql_default_engine_set(zRight) != 0) {
> -				pParse->is_aborted = true;
> -				goto pragma_out;
> -			}
> -			sqlVdbeAddOp0(v, OP_Expire);
> -		}
> -		break;
> -	}
> -
>  	default:
>  		unreachable();
>  	}			/* End of the PRAGMA switch */
>  
> -	/* The following block is a no-op unless SQL_DEBUG is
> -	 * defined. Its only * purpose is to execute assert()
> -	 * statements to verify that if the * PragFlg_NoColumns1 flag
> -	 * is set and the caller specified an argument * to the PRAGMA,
> -	 * the implementation has not added any OP_ResultRow *
> -	 * instructions to the VM.
> -	 */
> -	if ((pPragma->mPragFlg & PragFlg_NoColumns1) && zRight) {
> -		sqlVdbeVerifyNoResultRow(v);
> -	}
>   pragma_out:
>  	sqlDbFree(db, zLeft);
>  	sqlDbFree(db, zRight);
> diff --git a/src/box/sql/pragma.h b/src/box/sql/pragma.h
> index 6c9aa8d..6c66d97 100644
> --- a/src/box/sql/pragma.h
> +++ b/src/box/sql/pragma.h
> @@ -6,18 +6,14 @@
>  
>  /* The various pragma types */
>  #define PragTyp_COLLATION_LIST                 3
> -#define PragTyp_FLAG                           5
>  #define PragTyp_FOREIGN_KEY_LIST               9
>  #define PragTyp_INDEX_INFO                    10
>  #define PragTyp_INDEX_LIST                    11
>  #define PragTyp_STATS                         15
>  #define PragTyp_TABLE_INFO                    17
> -#define PragTyp_DEFAULT_ENGINE                25
>  
>  /* Property flags associated with various pragma. */
>  #define PragFlg_NeedSchema 0x01	/* Force schema load before running */
> -#define PragFlg_NoColumns  0x02	/* OP_ResultRow called with zero columns */
> -#define PragFlg_NoColumns1 0x04	/* zero columns if RHS argument is present */
>  #define PragFlg_Result0    0x10	/* Acts as query when no argument */
>  #define PragFlg_Result1    0x20	/* Acts as query when has one argument */
>  #define PragFlg_SchemaOpt  0x40	/* Schema restricts name search if present */
> @@ -92,51 +88,6 @@ static const char *const pragCName[] = {
>  	/*  55 */ "text",
>  	/*  56 */ "match",
>  	/*  57 */ "text",
> -	/* Used by: defer_foreign_keys */
> -	/*  58 */ "defer_foreign_keys",
> -	/*  59 */ "integer",
> -	/* Used by: full_column_names */
> -	/*  60 */ "full_column_names",
> -	/*  61 */ "integer",
> -	/* Used by: parser_trace */
> -	/*  62 */ "parser_trace",
> -	/*  63 */ "integer",
> -	/* Used by: recursive_triggers */
> -	/*  64 */ "recursive_triggers",
> -	/*  65 */ "integer",
> -	/* Used by: reverse_unordered_selects */
> -	/*  66 */ "reverse_unordered_selects",
> -	/*  67 */ "integer",
> -	/* Used by: select_trace */
> -	/*  68 */ "select_trace",
> -	/*  69 */ "integer",
> -	/* Used by: sql_default_engine */
> -	/*  70 */ "sql_default_engine",
> -	/*  71 */ "text",
> -	/* Used by: sql_trace */
> -	/*  72 */ "sql_trace",
> -	/*  73 */ "integer",
> -	/* Used by: vdbe_addoptrace */
> -	/*  74 */ "vdbe_addoptrace",
> -	/*  75 */ "integer",
> -	/* Used by: vdbe_debug */
> -	/*  76 */ "vdbe_debug",
> -	/*  77 */ "integer",
> -	/* Used by: vdbe_eqp */
> -	/*  78 */ "vdbe_eqp",
> -	/*  79 */ "integer",
> -	/* Used by: vdbe_listing */
> -	/*  80 */ "vdbe_listing",
> -	/*  81 */ "integer",
> -	/* Used by: vdbe_trace */
> -	/*  82 */ "vdbe_trace",
> -	/*  83 */ "integer",
> -	/* Used by: where_trace */
> -	/*  84 */ "where_trace",
> -	/*  85 */ "integer",
> -	/* Used by: full_metadata */
> -	/*  86 */ "full_metadata",
> -	/*  87 */ "integer",
>  };
>  
>  /* Definitions of all built-in pragmas */
> @@ -158,27 +109,12 @@ static const PragmaName aPragmaName[] = {
>  	 /* ePragFlg:  */ PragFlg_Result0,
>  	 /* ColNames:  */ 38, 2,
>  	 /* iArg:      */ 0},
> -	{ /* zName:     */ "defer_foreign_keys",
> -	 /* ePragTyp:  */ PragTyp_FLAG,
> -	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
> -	 /* ColNames:  */ 58, 1,
> -	 /* iArg:      */ SQL_DeferFKs},
>  	{ /* zName:     */ "foreign_key_list",
>  	 /* ePragTyp:  */ PragTyp_FOREIGN_KEY_LIST,
>  	 /* ePragFlg:  */
>  	 PragFlg_NeedSchema | PragFlg_Result1 | PragFlg_SchemaOpt,
>  	 /* ColNames:  */ 42, 8,
>  	 /* iArg:      */ 0},
> -	{ /* zName:     */ "full_column_names",
> -	 /* ePragTyp:  */ PragTyp_FLAG,
> -	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
> -	 /* ColNames:  */ 60, 1,
> -	 /* iArg:      */ SQL_FullColNames},
> -	{ /* zName:     */ "full_metadata",
> -	  /* ePragTyp:  */ PragTyp_FLAG,
> -	  /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
> -	  /* ColNames:  */ 86, 1,
> -	  /* iArg:      */ SQL_FullMetadata},
>  	{ /* zName:     */ "index_info",
>  	 /* ePragTyp:  */ PragTyp_INDEX_INFO,
>  	 /* ePragFlg:  */
> @@ -191,42 +127,6 @@ static const PragmaName aPragmaName[] = {
>  	 PragFlg_NeedSchema | PragFlg_Result1 | PragFlg_SchemaOpt,
>  	 /* ColNames:  */ 32, 3,
>  	 /* iArg:      */ 0},
> -#if defined(SQL_DEBUG)
> -	{ /* zName:     */ "parser_trace",
> -	 /* ePragTyp:  */ PragTyp_FLAG,
> -	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
> -	 /* ColNames:  */ 62, 1,
> -	 /* iArg:      */ PARSER_TRACE_FLAG},
> -#endif
> -	{ /* zName:     */ "recursive_triggers",
> -	 /* ePragTyp:  */ PragTyp_FLAG,
> -	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
> -	 /* ColNames:  */ 64, 1,
> -	 /* iArg:      */ SQL_RecTriggers},
> -	{ /* zName:     */ "reverse_unordered_selects",
> -	 /* ePragTyp:  */ PragTyp_FLAG,
> -	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
> -	 /* ColNames:  */ 66, 1,
> -	 /* iArg:      */ SQL_ReverseOrder},
> -#if defined(SQL_DEBUG)
> -	{ /* zName:     */ "select_trace",
> -	/* ePragTyp:  */ PragTyp_FLAG,
> -	/* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
> -	/* ColNames:  */ 68, 1,
> -	/* iArg:      */ SQL_SelectTrace},
> -#endif
> -	{ /* zName:     */ "sql_default_engine",
> -	 /* ePragTyp:  */ PragTyp_DEFAULT_ENGINE,
> -	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
> -	 /* ColNames:  */ 70, 1,
> -	 /* iArg:      */ 0},
> -#if defined(SQL_DEBUG)
> -	{ /* zName:     */ "sql_trace",
> -	 /* ePragTyp:  */ PragTyp_FLAG,
> -	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
> -	 /* ColNames:  */ 72, 1,
> -	 /* iArg:      */ SQL_SqlTrace},
> -#endif
>  	{ /* zName:     */ "stats",
>  	 /* ePragTyp:  */ PragTyp_STATS,
>  	 /* ePragFlg:  */
> @@ -239,38 +139,5 @@ static const PragmaName aPragmaName[] = {
>  	 PragFlg_NeedSchema | PragFlg_Result1 | PragFlg_SchemaOpt,
>  	 /* ColNames:  */ 0, 6,
>  	 /* iArg:      */ 0},
> -#if defined(SQL_DEBUG)
> -	{ /* zName:     */ "vdbe_addoptrace",
> -	 /* ePragTyp:  */ PragTyp_FLAG,
> -	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
> -	 /* ColNames:  */ 74, 1,
> -	 /* iArg:      */ SQL_VdbeAddopTrace},
> -	{ /* zName:     */ "vdbe_debug",
> -	 /* ePragTyp:  */ PragTyp_FLAG,
> -	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
> -	 /* ColNames:  */ 76, 1,
> -	 /* iArg:      */
> -	 SQL_SqlTrace | SQL_VdbeListing | SQL_VdbeTrace},
> -	{ /* zName:     */ "vdbe_eqp",
> -	 /* ePragTyp:  */ PragTyp_FLAG,
> -	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
> -	 /* ColNames:  */ 78, 1,
> -	 /* iArg:      */ SQL_VdbeEQP},
> -	{ /* zName:     */ "vdbe_listing",
> -	 /* ePragTyp:  */ PragTyp_FLAG,
> -	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
> -	 /* ColNames:  */ 80, 1,
> -	 /* iArg:      */ SQL_VdbeListing},
> -	{ /* zName:     */ "vdbe_trace",
> -	 /* ePragTyp:  */ PragTyp_FLAG,
> -	 /* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
> -	 /* ColNames:  */ 82, 1,
> -	 /* iArg:      */ SQL_VdbeTrace},
> -	{ /* zName:     */ "where_trace",
> -	/* ePragTyp:  */ PragTyp_FLAG,
> -	/* ePragFlg:  */ PragFlg_Result0 | PragFlg_NoColumns1,
> -	/* ColNames:  */ 84, 1,
> -	/* iArg:      */ SQL_WhereTrace},
> -#endif
>  };
>  /* Number of pragmas: 36 on by default, 47 total. */
> diff --git a/src/box/sql/sqlInt.h b/src/box/sql/sqlInt.h
> index 8d06921..3fafa81 100644
> --- a/src/box/sql/sqlInt.h
> +++ b/src/box/sql/sqlInt.h
> @@ -3779,7 +3779,6 @@ sql_space_def_check_format(const struct space_def *space_def);
>  void sqlDetach(Parse *, Expr *);
>  int sqlAtoF(const char *z, double *, int);
>  int sqlGetInt32(const char *, int *);
> -int sqlAtoi(const char *);
>  
>  /**
>   * Return number of symbols in the given string.
> @@ -3967,8 +3966,6 @@ int
>  sql_rem_int(int64_t lhs, bool is_lhs_neg, int64_t rhs, bool is_rhs_neg,
>  	    int64_t *res, bool *is_res_neg);
>  
> -u8 sqlGetBoolean(const char *z, u8);
> -
>  const void *sqlValueText(sql_value *);
>  int sqlValueBytes(sql_value *);
>  void sqlValueSetStr(sql_value *, int, const void *,
> diff --git a/src/box/sql/util.c b/src/box/sql/util.c
> index 0e115ac..f908e9c 100644
> --- a/src/box/sql/util.c
> +++ b/src/box/sql/util.c
> @@ -495,8 +495,6 @@ sql_atoi64(const char *z, int64_t *val, bool *is_neg, int length)
>   * This routine accepts both decimal and hexadecimal notation for integers.
>   *
>   * Any non-numeric characters that following zNum are ignored.
> - * This is different from sqlAtoi64() which requires the
> - * input number to be zero-terminated.
>   */
>  int
>  sqlGetInt32(const char *zNum, int *pValue)
> @@ -554,19 +552,6 @@ sqlGetInt32(const char *zNum, int *pValue)
>  }
>  
>  /*
> - * Return a 32-bit integer value extracted from a string.  If the
> - * string is not an integer, just return 0.
> - */
> -int
> -sqlAtoi(const char *z)
> -{
> -	int x = 0;
> -	if (z)
> -		sqlGetInt32(z, &x);
> -	return x;
> -}
> -
> -/*
>   * The variable-length integer encoding is as follows:
>   *
>   * KEY:
> diff --git a/src/box/sql/vdbe.c b/src/box/sql/vdbe.c
> index 9567ff2..4456c53 100644
> --- a/src/box/sql/vdbe.c
> +++ b/src/box/sql/vdbe.c
> @@ -4782,8 +4782,8 @@ case OP_Program: {        /* jump */
>  
>  	/* If the p5 flag is clear, then recursive invocation of triggers is
>  	 * disabled for backwards compatibility (p5 is set if this sub-program
> -	 * is really a trigger, not a foreign key action, and the flag set
> -	 * and cleared by the "PRAGMA recursive_triggers" command is clear).
> +	 * is really a trigger, not a foreign key action, and the setting
> +	 * 'recursive_triggers' is not set).
>  	 *
>  	 * It is recursive invocation of triggers, at the SQL level, that is
>  	 * disabled. In some cases a single trigger may generate more than one
> diff --git a/src/box/sql/vdbe.h b/src/box/sql/vdbe.h
> index 1e585d8..0f27030 100644
> --- a/src/box/sql/vdbe.h
> +++ b/src/box/sql/vdbe.h
> @@ -199,11 +199,6 @@ int sqlVdbeAddOp4(Vdbe *, int, int, int, int, const char *zP4, int);
>  int sqlVdbeAddOp4Dup8(Vdbe *, int, int, int, int, const u8 *, int);
>  int sqlVdbeAddOp4Int(Vdbe *, int, int, int, int, int);
>  void sqlVdbeEndCoroutine(Vdbe *, int);
> -#if defined(SQL_DEBUG) && !defined(SQL_TEST_REALLOC_STRESS)
> -void sqlVdbeVerifyNoResultRow(Vdbe * p);
> -#else
> -#define sqlVdbeVerifyNoResultRow(A)
> -#endif
>  void sqlVdbeChangeOpcode(Vdbe *, u32 addr, u8);
>  void sqlVdbeChangeP1(Vdbe *, u32 addr, int P1);
>  void sqlVdbeChangeP2(Vdbe *, u32 addr, int P2);
> diff --git a/src/box/sql/vdbeaux.c b/src/box/sql/vdbeaux.c
> index 5b4bc01..43e0566 100644
> --- a/src/box/sql/vdbeaux.c
> +++ b/src/box/sql/vdbeaux.c
> @@ -534,24 +534,6 @@ sqlVdbeCurrentAddr(Vdbe * p)
>  }
>  
>  /*
> - * Verify that the VM passed as the only argument does not contain
> - * an OP_ResultRow opcode. Fail an assert() if it does. This is used
> - * by code in pragma.c to ensure that the implementation of certain
> - * pragmas comports with the flags specified in the mkpragmatab.tcl
> - * script.
> - */
> -#if defined(SQL_DEBUG) && !defined(SQL_TEST_REALLOC_STRESS)
> -void
> -sqlVdbeVerifyNoResultRow(Vdbe * p)
> -{
> -	int i;
> -	for (i = 0; i < p->nOp; i++) {
> -		assert(p->aOp[i].opcode != OP_ResultRow);
> -	}
> -}
> -#endif
> -
> -/*
>   * This function returns a pointer to the array of opcodes associated with
>   * the Vdbe passed as the first argument. It is the callers responsibility
>   * to arrange for the returned array to be eventually freed using the
> diff --git a/test/box/sql-update-with-nested-select.result b/test/box/sql-update-with-nested-select.result
> index 4ff090f..cfcc28f 100644
> --- a/test/box/sql-update-with-nested-select.result
> +++ b/test/box/sql-update-with-nested-select.result
> @@ -7,8 +7,6 @@ box.execute("CREATE TABLE t1(a integer primary key, b int UNIQUE, e int);");
>  ---
>  - row_count: 1
>  ...
> --- Debug
> --- box.execute("PRAGMA vdbe_debug=ON ; INSERT INTO zoobar VALUES (111, 222, 'c3', 444)")
>  -- Seed entries
>  box.execute("INSERT INTO t1 VALUES(1,4,6);");
>  ---
> diff --git a/test/box/sql-update-with-nested-select.test.lua b/test/box/sql-update-with-nested-select.test.lua
> index 5c5dd96..c15b0de 100644
> --- a/test/box/sql-update-with-nested-select.test.lua
> +++ b/test/box/sql-update-with-nested-select.test.lua
> @@ -5,9 +5,6 @@ test_run = require('test_run').new()
>  -- create space
>  box.execute("CREATE TABLE t1(a integer primary key, b int UNIQUE, e int);");
>  
> --- Debug
> --- box.execute("PRAGMA vdbe_debug=ON ; INSERT INTO zoobar VALUES (111, 222, 'c3', 444)")
> -
>  -- Seed entries
>  box.execute("INSERT INTO t1 VALUES(1,4,6);");
>  box.execute("INSERT INTO t1 VALUES(2,5,7);");
> diff --git a/test/sql-tap/autoinc.test.lua b/test/sql-tap/autoinc.test.lua
> index 6105db3..37e65e5 100755
> --- a/test/sql-tap/autoinc.test.lua
> +++ b/test/sql-tap/autoinc.test.lua
> @@ -640,7 +640,8 @@ test:do_test(
>          -- </autoinc-10.3>
>      })
>  
> -test:catchsql(" pragma recursive_triggers = off ")
> +box.space._session_settings:update('sql_recursive_triggers', {{'=', 2, false}})
> +
>  -- Ticket #3928.  Make sure that triggers to not make extra slots in
>  -- the sql_SEQUENCE table.
>  --
> diff --git a/test/sql-tap/colname.test.lua b/test/sql-tap/colname.test.lua
> index de03d7c..caa61a0 100755
> --- a/test/sql-tap/colname.test.lua
> +++ b/test/sql-tap/colname.test.lua
> @@ -45,12 +45,12 @@ end
>  test:do_test(
>      "colname-1.1",
>      function()
> -        return test:execsql "PRAGMA full_column_names"
> -    end, {
> +        return box.space._session_settings:get("sql_full_column_names").value
> +    end,
>          -- <colname-1.2>
> -        0
> +        false
>          -- </colname-1.2>
> -    })
> +    )
>  
>  -- Tests for then short=ON and full=any
>  --
> @@ -163,7 +163,7 @@ test:do_test(
>      "colname-3.1",
>      function()
>          test:execsql [[
> -            PRAGMA full_column_names='OFF';
> +            UPDATE "_session_settings" SET "value" = false WHERE "name" = 'sql_full_column_names';
>              CREATE VIEW v3 AS SELECT tabC.a, txyZ.x, *
>                FROM tabc, txyz ORDER BY 1 LIMIT 1;
>              CREATE VIEW v4 AS SELECT tabC.a, txyZ.x, tboTh.a, tbotH.x, * 
> @@ -283,7 +283,7 @@ test:do_test(
>      "colname-4.1",
>      function()
>          test:execsql [[
> -            PRAGMA full_column_names='ON';
> +            UPDATE "_session_settings" SET "value" = true WHERE "name" = 'sql_full_column_names';
>              CREATE VIEW v5 AS SELECT tabC.a, txyZ.x, *
>                FROM tabc, txyz ORDER BY 1 LIMIT 1;
>              CREATE VIEW v6 AS SELECT tabC.a, txyZ.x, tboTh.a, tbotH.x, * 
> @@ -440,7 +440,7 @@ test:do_test(
>          -- instead of reconnect to database
>          -- we are just turning settings to default state
>          test:execsql([[
> -            PRAGMA full_column_names='OFF';
> +            UPDATE "_session_settings" SET "value" = false WHERE "name" = 'sql_full_column_names';
>              ]])
>          test:execsql [=[
>              CREATE TABLE t6(a INT primary key, "'a'" INT, """a""" INT, "[a]" INT,  "`a`" INT);
> diff --git a/test/sql-tap/fkey2.test.lua b/test/sql-tap/fkey2.test.lua
> index 264616d..bd3e0c7 100755
> --- a/test/sql-tap/fkey2.test.lua
> +++ b/test/sql-tap/fkey2.test.lua
> @@ -450,7 +450,7 @@ test:do_execsql_test(
>  test:do_execsql_test(
>      "fkey2-4.2",
>      [[
> -        PRAGMA recursive_triggers = off;
> +        UPDATE "_session_settings" SET "value" = false WHERE "name" = 'sql_recursive_triggers';
>          DELETE FROM t1 WHERE node = 1;
>          SELECT node FROM t1;
>      ]], {
> @@ -473,7 +473,7 @@ test:do_execsql_test(
>  test:do_execsql_test(
>      "fkey2-4.4",
>      [[
> -        PRAGMA recursive_triggers = on;
> +        UPDATE "_session_settings" SET "value" = true WHERE "name" = 'sql_recursive_triggers';
>          DROP TABLE t2;
>          DROP TABLE t1;
>          CREATE TABLE t1(
> diff --git a/test/sql-tap/lua/sqltester.lua b/test/sql-tap/lua/sqltester.lua
> index 0f34114..9b0218e 100644
> --- a/test/sql-tap/lua/sqltester.lua
> +++ b/test/sql-tap/lua/sqltester.lua
> @@ -413,7 +413,7 @@ box.cfg{
>  }
>  
>  local engine = test_run and test_run:get_cfg('engine') or 'memtx'
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  function test.engine(self)
>      return engine
> diff --git a/test/sql-tap/misc1.test.lua b/test/sql-tap/misc1.test.lua
> index b47dbf0..32f38cc 100755
> --- a/test/sql-tap/misc1.test.lua
> +++ b/test/sql-tap/misc1.test.lua
> @@ -219,7 +219,7 @@ test:do_test(
>          local r = test:execsql([[
>              CREATE TABLE t1(a TEXT primary KEY);
>              INSERT INTO t1 VALUES('hi');
> -            PRAGMA full_column_names=on;
> +            UPDATE "_session_settings" SET "value" = true WHERE "name" = 'sql_full_column_names';
>              --SELECT rowid, * FROM t1;
>              SELECT * FROM t1;
>          ]])
> diff --git a/test/sql-tap/pragma.test.lua b/test/sql-tap/pragma.test.lua
> index c36f9b9..d6f8b54 100755
> --- a/test/sql-tap/pragma.test.lua
> +++ b/test/sql-tap/pragma.test.lua
> @@ -1,7 +1,7 @@
>  #!/usr/bin/env tarantool
>  test = require("sqltester")
>  
> -test:plan(23)
> +test:plan(10)
>  
>  test:do_catchsql_test(
>  	"pragma-1.3",
> @@ -19,66 +19,7 @@ test:do_catchsql_test(
>  	[[
>  		pragma sql_default_engine='creepy';
>  	]], {
> -	1, "Space engine 'creepy' does not exist"
> -})
> -
> -test:do_catchsql_test(
> -	"pragma-2.2",
> -	[[
> -		pragma sql_default_engine='vinyl';
> -	]], {
> -	0
> -})
> -
> -test:do_catchsql_test(
> -	"pragma-2.3",
> -	[[
> -		pragma sql_default_engine='memtx';
> -	]], {
> -	0
> -})
> -
> -test:do_catchsql_test(
> -	"pragma-2.4",
> -	[[
> -		pragma sql_default_engine 'memtx';
> -	]], {
> -	1, "Syntax error at line 1 near ''memtx''"
> -})
> -
> -test:do_catchsql_test(
> -	"pragma-2.5",
> -	[[
> -		pragma sql_default_engine 1;
> -	]], {
> -	1, "Syntax error at line 1 near '1'"
> -})
> -
> ---
> --- gh-3832: Some statements do not return column type
> ---
> --- Check that "PRAGMA sql_default_engine" called without arguments
> --- returns currently set sql_default_engine.
> -test:do_execsql_test(
> -	"pragma-3.1",
> -	[[
> -		pragma sql_default_engine='vinyl';
> -		pragma sql_default_engine;
> -	]], {
> -	-- <pragma-3.1>
> -	'vinyl'
> -	-- </pragma-3.1>
> -})
> -
> -test:do_execsql_test(
> -	"pragma-3.2",
> -	[[
> -		pragma sql_default_engine='memtx';
> -		pragma sql_default_engine;
> -	]], {
> -	-- <pragma-3.2>
> -	'memtx'
> -	-- </pragma-3.2>
> +	1, "Pragma 'SQL_DEFAULT_ENGINE' does not exist"
>  })
>  
>  --
> @@ -187,76 +128,4 @@ test:do_execsql_test(
>  	-- </pragma-8.4>
>  })
>  
> ----
> ---- pragma sql_default_engine accepts string values and rejects IDs
> ----
> -test:do_catchsql_test(
> -	"pragma-9.1",
> -	[[
> -		pragma sql_default_engine(the_engine);
> -	]], {
> -	-- <pragma-9.1>
> -	1, "Illegal parameters, string value is expected"
> -	-- </pragma-9.1>
> -})
> -
> -test:do_catchsql_test(
> -	"pragma-9.2",
> -	[[
> -		pragma sql_default_engine(THE_ENGINE);
> -	]], {
> -	-- <pragma-9.2>
> -	1, "Illegal parameters, string value is expected"
> -	-- </pragma-9.2>
> -})
> -
> -test:do_catchsql_test(
> -	"pragma-9.3",
> -	[[
> -		pragma sql_default_engine("THE_ENGINE");
> -	]], {
> -	-- <pragma-9.3>
> -	1, "Illegal parameters, string value is expected"
> -	-- </pragma-9.3>
> -})
> -
> -test:do_catchsql_test(
> -	"pragma-9.4",
> -	[[
> -		pragma sql_default_engine('THE_ENGINE');
> -	]], {
> -	-- <pragma-9.4>
> -	1, "Space engine 'THE_ENGINE' does not exist"
> -	-- </pragma-9.4>
> -})
> -
> -test:do_catchsql_test(
> -	"pragma-9.5",
> -	[[
> -		pragma sql_default_engine(memtx);
> -	]], {
> -	-- <pragma-9.5>
> -	1, "Illegal parameters, string value is expected"
> -	-- </pragma-9.5>
> -})
> -
> -test:do_catchsql_test(
> -	"pragma-9.6",
> -	[[
> -		pragma sql_default_engine("memtx");
> -	]], {
> -	-- <pragma-9.6>
> -	1, "Illegal parameters, string value is expected"
> -	-- </pragma-9.6>
> -})
> -
> -test:do_execsql_test(
> -	"pragma-9.7",
> -	[[
> -		pragma sql_default_engine('memtx');
> -	]], {
> -	-- <pragma-9.7>
> -	-- </pragma-9.7>
> -})
> -
>  test:finish_test()
> diff --git a/test/sql-tap/select1.test.lua b/test/sql-tap/select1.test.lua
> index 7029d27..fbebfab 100755
> --- a/test/sql-tap/select1.test.lua
> +++ b/test/sql-tap/select1.test.lua
> @@ -2,6 +2,12 @@
>  test = require("sqltester")
>  test:plan(173)
>  
> +function set_full_column_names(value)
> +    box.space._session_settings:update('sql_full_column_names', {
> +        {'=', 2, value}
> +    })
> +end
> +
>  --!./tcltestrunner.lua
>  -- ["set","testdir",[["file","dirname",["argv0"]]]]
>  -- ["source",[["testdir"],"\/tester.tcl"]]
> @@ -916,7 +922,7 @@ test:do_catchsql2_test(
>  test:do_test(
>      "select1-6.1.1",
>      function()
> -        test:execsql "PRAGMA full_column_names=on"
> +        set_full_column_names(true)
>          return test:catchsql2 "SELECT f1 FROM test1 ORDER BY f2"
>      end, {
>          -- <select1-6.1.1>
> @@ -952,7 +958,7 @@ test:do_test(
>              msg = test:execsql2 "SELECT DISTINCT * FROM test1 WHERE f1==11"
>              end)
>          v = v == true and {0} or {1} 
> -        test:execsql "PRAGMA full_column_names=off"
> +        set_full_column_names(false)
>          return table.insert(v,msg) or v
>      end, {
>          -- <select1-6.1.4>
> @@ -1043,13 +1049,13 @@ test:do_catchsql2_test(
>  test:do_test(
>      "select1-6.5.1",
>      function()
> -        test:execsql2 "PRAGMA full_column_names=on"
> +        set_full_column_names(true)
>          local msg
>          v = pcall( function ()
>                  msg = test:execsql2 "SELECT test1.f1+F2 FROM test1 ORDER BY f2"
>              end)
>          v = v == true and {0} or {1}
> -        test:execsql2 "PRAGMA full_column_names=off"
> +        set_full_column_names(false)
>          return table.insert(v,msg) or v
>      end, {
>          -- <select1-6.5.1>
> @@ -1123,9 +1129,7 @@ test:do_catchsql2_test(
>  test:do_test(
>      "select1-6.9.3",
>      function()
> -        test:execsql [[
> -            PRAGMA full_column_names='OFF';
> -        ]]
> +        set_full_column_names(false)
>          return test:execsql2 [[
>              SELECT test1 . f1, test1 . f2 FROM test1 LIMIT 1
>          ]]
> @@ -1138,9 +1142,7 @@ test:do_test(
>  test:do_test(
>      "select1-6.9.4",
>      function()
> -        test:execsql [[
> -            PRAGMA full_column_names='ON';
> -        ]]
> +        set_full_column_names(true)
>          return test:execsql2 [[
>              SELECT test1 . f1, test1 . f2 FROM test1 LIMIT 1
>          ]]
> @@ -1153,9 +1155,7 @@ test:do_test(
>  test:do_test(
>      "select1-6.9.5",
>      function()
> -        test:execsql [[
> -            PRAGMA full_column_names='ON';
> -        ]]
> +        set_full_column_names(true)
>          return test:execsql2 [[
>              SELECT 123.45;
>          ]]
> @@ -1234,9 +1234,7 @@ test:do_execsql2_test(
>  test:do_test(
>      "select1-6.9.11",
>      function()
> -        test:execsql [[
> -            PRAGMA full_column_names='ON';
> -        ]]
> +        set_full_column_names(true)
>          return test:execsql2 [[
>              SELECT a.f1, b.f2 FROM test1 a, test1 b LIMIT 1
>          ]]
> @@ -1259,9 +1257,7 @@ test:do_execsql2_test(
>  test:do_test(
>      "select1-6.9.13",
>      function()
> -        test:execsql [[
> -            PRAGMA full_column_names='OFF';
> -        ]]
> +        set_full_column_names(false)
>          return test:execsql2 [[
>              SELECT a.f1, b.f1 FROM test1 a, test1 b LIMIT 1
>          ]]
> @@ -1284,9 +1280,7 @@ test:do_execsql2_test(
>  test:do_test(
>      "select1-6.9.15",
>      function()
> -        test:execsql [[
> -            PRAGMA full_column_names='ON';
> -        ]]
> +        set_full_column_names(true)
>          return test:execsql2 [[
>              SELECT a.f1, b.f1 FROM test1 a, test1 b LIMIT 1
>          ]]
> @@ -1306,9 +1300,7 @@ test:do_execsql2_test(
>          -- </select1-6.9.16>
>      })
>  
> -test:execsql [[
> -    PRAGMA full_column_names='OFF';
> -]]
> +set_full_column_names(false)
>  test:do_catchsql2_test(
>          "select1-6.10",
>          [[
> diff --git a/test/sql-tap/tkt3731.test.lua b/test/sql-tap/tkt3731.test.lua
> index 454cf67..092e8bf 100755
> --- a/test/sql-tap/tkt3731.test.lua
> +++ b/test/sql-tap/tkt3731.test.lua
> @@ -22,7 +22,7 @@ test:plan(3)
>  -- The tests in this file were written before sql supported recursive
>  -- trigger invocation, and some tests depend on that to pass. So disable
>  -- recursive triggers for this file.
> -test:catchsql " pragma recursive_triggers = off "
> +box.space._session_settings:update('sql_recursive_triggers', {{'=', 2, false}})
>  test:do_execsql_test(
>      "tkt3731-1.1",
>      [[
> diff --git a/test/sql-tap/trigger2.test.lua b/test/sql-tap/trigger2.test.lua
> index 6e60050..192b707 100755
> --- a/test/sql-tap/trigger2.test.lua
> +++ b/test/sql-tap/trigger2.test.lua
> @@ -58,7 +58,8 @@ test:plan(26)
>  -- The tests in this file were written before sql supported recursive
>  -- trigger invocation, and some tests depend on that to pass. So disable
>  -- recursive triggers for this file.
> -test:catchsql " pragma recursive_triggers = off "
> +
> +box.space._session_settings:update('sql_recursive_triggers', {{'=', 2, false}})
>  -- 1.
>  ii = 0
>  tbl_definitions = { "CREATE TABLE tbl (id INT PRIMARY KEY AUTOINCREMENT, a INTEGER UNIQUE, b INT );",
> diff --git a/test/sql-tap/triggerC.test.lua b/test/sql-tap/triggerC.test.lua
> index cf7dd7b..ef4d69d 100755
> --- a/test/sql-tap/triggerC.test.lua
> +++ b/test/sql-tap/triggerC.test.lua
> @@ -1,6 +1,6 @@
>  #!/usr/bin/env tarantool
>  test = require("sqltester")
> -test:plan(48)
> +test:plan(43)
>  
>  --!./tcltestrunner.lua
>  -- 2009 August 24
> @@ -36,12 +36,9 @@ testprefix = "triggerC"
>  --               REPLACE conflict resolution. And that they are not fired
>  --               if recursive triggers are not enabled.
>  --
> --- triggerC-6.*: Test that the recursive_triggers pragma returns correct
> ---               results when invoked without an argument.
> ---
>  -- Enable recursive triggers for this file.
>  --
> -test:execsql " PRAGMA recursive_triggers = on "
> +box.space._session_settings:update('sql_recursive_triggers', {{'=', 2, true}})
>  ---------------------------------------------------------------------------
>  -- This block of tests, triggerC-1.*, are not aimed at any specific
>  -- property of the triggers sub-system. They were created to debug
> @@ -501,15 +498,6 @@ test:do_execsql_test(
>  --     "
>  --   } [concat $t5g $t5]
>  -- }
> -test:do_execsql_test(
> -    "triggerC-5.3.0",
> -    [[
> -        PRAGMA recursive_triggers = off
> -    ]], {
> -        -- <triggerC-5.3.0>
> -
> -        -- </triggerC-5.3.0>
> -    })
>  
>  -- MUST_WORK_TEST
>  -- foreach {n dml t5g t5} {
> @@ -531,51 +519,6 @@ test:do_execsql_test(
>  --     "
>  --   } [concat $t5g $t5]
>  -- }
> -test:do_execsql_test(
> -    "triggerC-5.3.8",
> -    [[
> -        PRAGMA recursive_triggers = on
> -    ]], {
> -        -- <triggerC-5.3.8>
> -
> -        -- </triggerC-5.3.8>
> -    })
> -
> ----------------------------------------------------------------------------
> --- This block of tests, triggerC-6.*, tests that "PRAGMA recursive_triggers"
> --- statements return the current value of the recursive triggers flag.
> ---
> -test:do_execsql_test(
> -    "triggerC-6.1",
> -    [[
> -        PRAGMA recursive_triggers
> -    ]], {
> -        -- <triggerC-6.1>
> -        1
> -        -- </triggerC-6.1>
> -    })
> -
> -test:do_execsql_test(
> -    "triggerC-6.2",
> -    [[
> -        PRAGMA recursive_triggers = off;
> -        PRAGMA recursive_triggers;
> -    ]], {
> -        -- <triggerC-6.2>
> -        0
> -        -- </triggerC-6.2>
> -    })
> -
> -test:do_execsql_test(
> -    "triggerC-6.3",
> -    [[
> -        PRAGMA recursive_triggers = on;
> -        PRAGMA recursive_triggers;
> -    ]], {
> -        -- <triggerC-6.3>
> -        1
> -        -- </triggerC-6.3>
> -    })
>  
>  -- MUST_WORK_TEST
>  -- #-------------------------------------------------------------------------
> @@ -890,7 +833,7 @@ test:execsql(
>  test:do_execsql_test(
>      "triggerC-13.1",
>      [[
> -        PRAGMA recursive_triggers = 'ON';
> +        UPDATE "_session_settings" SET "value" = true WHERE "name" = 'sql_recursive_triggers';
>          CREATE TABLE t12(id INTEGER PRIMARY KEY, a INT, b INT);
>          INSERT INTO t12 VALUES(1, 1, 2);
>          CREATE TRIGGER tr12 AFTER UPDATE ON t12 FOR EACH ROW BEGIN
> @@ -974,7 +917,7 @@ test:do_execsql_test(
>  test:do_execsql_test(
>      "triggerC-15.1.1",
>      [[
> -        PRAGMA recursive_triggers = 1;
> +        UPDATE "_session_settings" SET "value" = true WHERE "name" = 'sql_recursive_triggers';
>          CREATE TABLE node(
>              id int not null primary key,
>              pid int not null default 0,
> diff --git a/test/sql-tap/whereA.test.lua b/test/sql-tap/whereA.test.lua
> index b82575f..a49d1c0 100755
> --- a/test/sql-tap/whereA.test.lua
> +++ b/test/sql-tap/whereA.test.lua
> @@ -39,7 +39,7 @@ test:do_test(
>      "whereA-1.2",
>      function()
>          return test:execsql [[
> -            PRAGMA reverse_unordered_selects=1;
> +            UPDATE "_session_settings" SET "value" = true WHERE "name" = 'sql_reverse_unordered_selects';
>              SELECT * FROM t1;
>          ]]
>      end, {
> @@ -55,7 +55,7 @@ test:do_test(
>          --db close
>          --sql db test.db
>          return test:execsql [[
> -            PRAGMA reverse_unordered_selects=1;
> +            UPDATE "_session_settings" SET "value" = true WHERE "name" = 'sql_reverse_unordered_selects';
>              SELECT * FROM t1;
>          ]]
>      end, {
> @@ -75,14 +75,12 @@ test:do_test(
>  test:do_test(
>      "whereA-1.6",
>      function()
> -        return test:execsql [[
> -            PRAGMA reverse_unordered_selects;
> -        ]]
> -    end, {
> +        return box.space._session_settings:get('sql_reverse_unordered_selects').value
> +    end,
>          -- <whereA-1.6>
> -        1
> +        true
>          -- </whereA-1.6>
> -    })
> +    )
>  
>  test:do_execsql_test(
>      "whereA-1.8",
> @@ -108,7 +106,7 @@ test:do_test(
>      "whereA-2.1",
>      function()
>          return test:execsql [[
> -            PRAGMA reverse_unordered_selects=0;
> +            UPDATE "_session_settings" SET "value" = false WHERE "name" = 'sql_reverse_unordered_selects';
>              SELECT * FROM t1 WHERE a>0;
>          ]]
>      end, {
> @@ -121,7 +119,7 @@ test:do_test(
>      "whereA-2.2",
>      function()
>          return test:execsql [[
> -            PRAGMA reverse_unordered_selects=1;
> +            UPDATE "_session_settings" SET "value" = true WHERE "name" = 'sql_reverse_unordered_selects';
>              SELECT * FROM t1 WHERE a>0;
>          ]]
>      end, {
> @@ -140,7 +138,7 @@ test:do_test(
>      "whe:reA-3.1",
>      function()
>          return test:execsql [[
> -            PRAGMA reverse_unordered_selects=0;
> +            UPDATE "_session_settings" SET "value" = false WHERE "name" = 'sql_reverse_unordered_selects';
>              SELECT * FROM t1 WHERE b>0;
>          ]]
>      end, {
> @@ -153,7 +151,7 @@ test:do_test(
>      "whereA-3.2",
>      function()
>          return test:execsql [[
> -            PRAGMA reverse_unordered_selects=1;
> +            UPDATE "_session_settings" SET "value" = true WHERE "name" = 'sql_reverse_unordered_selects';
>              SELECT * FROM t1 WHERE b>0;
>          ]]
>      end, {
> @@ -166,7 +164,7 @@ test:do_test(
>      "whereA-3.3",
>      function()
>          return test:execsql [[
> -            PRAGMA reverse_unordered_selects=1;
> +            UPDATE "_session_settings" SET "value" = true WHERE "name" = 'sql_reverse_unordered_selects';
>              SELECT * FROM t1 WHERE b>0 ORDER BY b;
>          ]]
>      end, {
> diff --git a/test/sql/check-clear-ephemeral.result b/test/sql/check-clear-ephemeral.result
> index 7d0be5f..ba28b50 100644
> --- a/test/sql/check-clear-ephemeral.result
> +++ b/test/sql/check-clear-ephemeral.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- box.cfg()
>  -- create space
> @@ -14,8 +13,6 @@ box.execute("CREATE TABLE t1(a INT,b INT,c INT,PRIMARY KEY(b,c));")
>  ---
>  - row_count: 1
>  ...
> --- Debug
> --- box.execute("PRAGMA vdbe_debug=ON ; INSERT INTO zoobar VALUES (111, 222, 'c3', 444)")
>  -- Seed entries
>  box.execute("WITH RECURSIVE cnt(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM cnt WHERE x<1000) INSERT INTO t1 SELECT x, x%40, x/40 FROM cnt;")
>  ---
> diff --git a/test/sql/check-clear-ephemeral.test.lua b/test/sql/check-clear-ephemeral.test.lua
> index 929a6c9..694d9a8 100644
> --- a/test/sql/check-clear-ephemeral.test.lua
> +++ b/test/sql/check-clear-ephemeral.test.lua
> @@ -1,14 +1,11 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  -- box.cfg()
>  
>  -- create space
>  box.execute("CREATE TABLE t1(a INT,b INT,c INT,PRIMARY KEY(b,c));")
>  
> --- Debug
> --- box.execute("PRAGMA vdbe_debug=ON ; INSERT INTO zoobar VALUES (111, 222, 'c3', 444)")
> -
>  -- Seed entries
>  box.execute("WITH RECURSIVE cnt(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM cnt WHERE x<1000) INSERT INTO t1 SELECT x, x%40, x/40 FROM cnt;")
>  
> diff --git a/test/sql/checks.result b/test/sql/checks.result
> index dfea848..0a4b9ca 100644
> --- a/test/sql/checks.result
> +++ b/test/sql/checks.result
> @@ -11,9 +11,8 @@ test_run:cmd("push filter ".."'\\.lua.*:[0-9]+: ' to '.lua...\"]:<line>: '")
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  --
>  -- gh-3272: Move SQL CHECK into server
> @@ -733,13 +732,6 @@ physics_ck:drop()
>  -- Make sure that ck constraints are turned on/off with
>  -- :enable configurator.
>  --
> -engine = test_run:get_cfg('engine')
> ----
> -...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> ----
> -- row_count: 0
> -...
>  box.execute("CREATE TABLE test(a INT PRIMARY KEY);");
>  ---
>  - row_count: 1
> diff --git a/test/sql/checks.test.lua b/test/sql/checks.test.lua
> index 4d33823..301f8ea 100644
> --- a/test/sql/checks.test.lua
> +++ b/test/sql/checks.test.lua
> @@ -2,7 +2,7 @@ env = require('test_run')
>  test_run = env.new()
>  test_run:cmd("push filter ".."'\\.lua.*:[0-9]+: ' to '.lua...\"]:<line>: '")
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  --
>  -- gh-3272: Move SQL CHECK into server
> @@ -239,8 +239,6 @@ physics_ck:drop()
>  -- Make sure that ck constraints are turned on/off with
>  -- :enable configurator.
>  --
> -engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
>  box.execute("CREATE TABLE test(a INT PRIMARY KEY);");
>  box.execute('ALTER TABLE test ADD CONSTRAINT CK CHECK(a < 5);')
>  box.space.TEST:insert({10})
> diff --git a/test/sql/clear.result b/test/sql/clear.result
> index afa6520..2844a1e 100644
> --- a/test/sql/clear.result
> +++ b/test/sql/clear.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- box.cfg()
>  -- create space
> @@ -18,8 +17,6 @@ box.execute("CREATE UNIQUE INDEX zoobar2 ON zoobar(c1, c4)")
>  ---
>  - row_count: 1
>  ...
> --- Debug
> --- box.execute("PRAGMA vdbe_debug=ON;")
>  -- Seed entry
>  for i=1, 100 do box.execute(string.format("INSERT INTO zoobar VALUES (%d, %d, 'c3', 444)", i+i, i)) end
>  ---
> diff --git a/test/sql/clear.test.lua b/test/sql/clear.test.lua
> index 4c58767..d099de5 100644
> --- a/test/sql/clear.test.lua
> +++ b/test/sql/clear.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- box.cfg()
>  
> @@ -8,9 +8,6 @@ box.execute('pragma sql_default_engine=\''..engine..'\'')
>  box.execute("CREATE TABLE zoobar (c1 INT, c2 INT PRIMARY KEY, c3 TEXT, c4 INT)")
>  box.execute("CREATE UNIQUE INDEX zoobar2 ON zoobar(c1, c4)")
>  
> --- Debug
> --- box.execute("PRAGMA vdbe_debug=ON;")
> -
>  -- Seed entry
>  for i=1, 100 do box.execute(string.format("INSERT INTO zoobar VALUES (%d, %d, 'c3', 444)", i+i, i)) end
>  
> diff --git a/test/sql/collation.result b/test/sql/collation.result
> index f8696b6..4e43a7c 100644
> --- a/test/sql/collation.result
> +++ b/test/sql/collation.result
> @@ -7,9 +7,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- gh-3010: COLLATE after LIMIT should throw an error
>  -- All of these tests should throw error "near "COLLATE": syntax error"
> diff --git a/test/sql/collation.test.lua b/test/sql/collation.test.lua
> index a013253..9a2042c 100644
> --- a/test/sql/collation.test.lua
> +++ b/test/sql/collation.test.lua
> @@ -1,7 +1,7 @@
>  remote = require('net.box')
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- gh-3010: COLLATE after LIMIT should throw an error
>  
> diff --git a/test/sql/ddl.result b/test/sql/ddl.result
> index 28acf37..aecd57a 100644
> --- a/test/sql/ddl.result
> +++ b/test/sql/ddl.result
> @@ -8,9 +8,8 @@ json = require('json')
>  engine = test_run:get_cfg('engine')
>   | ---
>   | ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>   | ---
> - | - row_count: 0
>   | ...
>  
>  --
> diff --git a/test/sql/ddl.test.lua b/test/sql/ddl.test.lua
> index 6067b61..b99a520 100644
> --- a/test/sql/ddl.test.lua
> +++ b/test/sql/ddl.test.lua
> @@ -1,7 +1,7 @@
>  test_run = require('test_run').new()
>  json = require('json')
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  --
>  -- gh-4086: SQL transactional DDL.
> diff --git a/test/sql/delete-multiple-idx.result b/test/sql/delete-multiple-idx.result
> index ca58feb..b517b5d 100644
> --- a/test/sql/delete-multiple-idx.result
> +++ b/test/sql/delete-multiple-idx.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- box.cfg()
>  -- Create space.
> @@ -18,8 +17,6 @@ box.execute("CREATE UNIQUE INDEX t3y ON t3(y);");
>  ---
>  - row_count: 1
>  ...
> --- Debug.
> --- box.execute("PRAGMA vdbe_debug=ON ; INSERT INTO zoobar VALUES (111, 222, 'c3', 444)")
>  -- Seed entries.
>  box.execute("INSERT INTO t3 VALUES (1, 1, NULL);");
>  ---
> diff --git a/test/sql/delete-multiple-idx.test.lua b/test/sql/delete-multiple-idx.test.lua
> index a81cccc..2ca07da 100644
> --- a/test/sql/delete-multiple-idx.test.lua
> +++ b/test/sql/delete-multiple-idx.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- box.cfg()
>  
> @@ -8,9 +8,6 @@ box.execute('pragma sql_default_engine=\''..engine..'\'')
>  box.execute("CREATE TABLE t3(id INT primary key,x INT,y INT);");
>  box.execute("CREATE UNIQUE INDEX t3y ON t3(y);");
>  
> --- Debug.
> --- box.execute("PRAGMA vdbe_debug=ON ; INSERT INTO zoobar VALUES (111, 222, 'c3', 444)")
> -
>  -- Seed entries.
>  box.execute("INSERT INTO t3 VALUES (1, 1, NULL);");
>  box.execute("INSERT INTO t3 VALUES(2,9,NULL);");
> diff --git a/test/sql/delete.result b/test/sql/delete.result
> index e27c79d..8c53342 100644
> --- a/test/sql/delete.result
> +++ b/test/sql/delete.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- box.cfg()
>  -- create space
> @@ -14,8 +13,6 @@ box.execute("CREATE TABLE t1(a INT, b INT, PRIMARY KEY(a, b));");
>  ---
>  - row_count: 1
>  ...
> --- Debug
> --- box.execute("PRAGMA vdbe_debug=ON ; INSERT INTO zoobar VALUES (111, 222, 'c3', 444)")
>  -- Seed entries
>  box.execute("INSERT INTO t1 VALUES(1, 2);");
>  ---
> diff --git a/test/sql/delete.test.lua b/test/sql/delete.test.lua
> index 75448d4..130a8ed 100644
> --- a/test/sql/delete.test.lua
> +++ b/test/sql/delete.test.lua
> @@ -1,15 +1,12 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- box.cfg()
>  
>  -- create space
>  box.execute("CREATE TABLE t1(a INT, b INT, PRIMARY KEY(a, b));");
>  
> --- Debug
> --- box.execute("PRAGMA vdbe_debug=ON ; INSERT INTO zoobar VALUES (111, 222, 'c3', 444)")
> -
>  -- Seed entries
>  box.execute("INSERT INTO t1 VALUES(1, 2);");
>  box.execute("INSERT INTO t1 VALUES(2, 4);");
> diff --git a/test/sql/drop-index.result b/test/sql/drop-index.result
> index e8eb642..0c7fe80 100644
> --- a/test/sql/drop-index.result
> +++ b/test/sql/drop-index.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- box.cfg()
>  -- create space
> @@ -22,8 +21,6 @@ box.execute("CREATE        INDEX zoobar3 ON zzoobar(c3)")
>  ---
>  - row_count: 1
>  ...
> --- Debug
> --- box.execute("PRAGMA vdbe_debug=ON ; INSERT INTO zzoobar VALUES (111, 222, 'c3', 444)")
>  -- Dummy entry
>  box.execute("INSERT INTO zzoobar VALUES (111, 222, 'c3', 444)")
>  ---
> diff --git a/test/sql/drop-index.test.lua b/test/sql/drop-index.test.lua
> index 8cd86ee..13cd6be 100644
> --- a/test/sql/drop-index.test.lua
> +++ b/test/sql/drop-index.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- box.cfg()
>  
> @@ -10,9 +10,6 @@ box.execute("CREATE TABLE zzoobar (c1 NUMBER, c2 INT PRIMARY KEY, c3 TEXT, c4 NU
>  box.execute("CREATE UNIQUE INDEX zoobar2 ON zzoobar(c1, c4)")
>  box.execute("CREATE        INDEX zoobar3 ON zzoobar(c3)")
>  
> --- Debug
> --- box.execute("PRAGMA vdbe_debug=ON ; INSERT INTO zzoobar VALUES (111, 222, 'c3', 444)")
> -
>  -- Dummy entry
>  box.execute("INSERT INTO zzoobar VALUES (111, 222, 'c3', 444)")
>  
> diff --git a/test/sql/drop-table.result b/test/sql/drop-table.result
> index 7bc073d..807b42c 100644
> --- a/test/sql/drop-table.result
> +++ b/test/sql/drop-table.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- box.cfg()
>  -- create space
> @@ -14,8 +13,6 @@ box.execute("CREATE TABLE zzzoobar (c1 INT, c2 INT PRIMARY KEY, c3 TEXT, c4 INT)
>  ---
>  - row_count: 1
>  ...
> --- Debug
> --- box.execute("PRAGMA vdbe_debug=ON ; INSERT INTO zzzoobar VALUES (111, 222, 'c3', 444)")
>  box.execute("CREATE INDEX zb ON zzzoobar(c1, c3)")
>  ---
>  - row_count: 1
> diff --git a/test/sql/drop-table.test.lua b/test/sql/drop-table.test.lua
> index a310db1..19ee639 100644
> --- a/test/sql/drop-table.test.lua
> +++ b/test/sql/drop-table.test.lua
> @@ -1,15 +1,12 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- box.cfg()
>  
>  -- create space
>  box.execute("CREATE TABLE zzzoobar (c1 INT, c2 INT PRIMARY KEY, c3 TEXT, c4 INT)")
>  
> --- Debug
> --- box.execute("PRAGMA vdbe_debug=ON ; INSERT INTO zzzoobar VALUES (111, 222, 'c3', 444)")
> -
>  box.execute("CREATE INDEX zb ON zzzoobar(c1, c3)")
>  
>  -- Dummy entry
> diff --git a/test/sql/engine.cfg b/test/sql/engine.cfg
> index efc42a1..a97f60a 100644
> --- a/test/sql/engine.cfg
> +++ b/test/sql/engine.cfg
> @@ -2,9 +2,6 @@
>      "vinyl-opts.test.lua" : {
>          "vinyl": {"engine": "vinyl"}
>      },
> -    "sql-debug.test.lua": {
> -        "memtx": {"engine": "memtx"}
> -    },
>      "bind.test.lua": {
>          "remote": {"remote": "true"},
>          "local": {"remote": "false"}
> diff --git a/test/sql/engine.result b/test/sql/engine.result
> index ff87129..a246677 100644
> --- a/test/sql/engine.result
> +++ b/test/sql/engine.result
> @@ -4,9 +4,9 @@ env = require('test_run')
>  test_run = env.new()
>  ---
>  ...
> -box.execute("pragma sql_default_engine='vinyl'")
> +box.space._session_settings:update('sql_default_engine', {{'=', 2, 'vinyl'}})
>  ---
> -- row_count: 0
> +- ['sql_default_engine', 'vinyl']
>  ...
>  box.execute("CREATE TABLE t1_vinyl(a INT PRIMARY KEY, b INT, c INT);")
>  ---
> @@ -16,9 +16,9 @@ box.execute("CREATE TABLE t2_vinyl(a INT PRIMARY KEY, b INT, c INT);")
>  ---
>  - row_count: 1
>  ...
> -box.execute("pragma sql_default_engine='memtx'")
> +box.space._session_settings:update('sql_default_engine', {{'=', 2, 'memtx'}})
>  ---
> -- row_count: 0
> +- ['sql_default_engine', 'memtx']
>  ...
>  box.execute("CREATE TABLE t3_memtx(a INT PRIMARY KEY, b INT, c INT);")
>  ---
> @@ -66,9 +66,9 @@ assert(box.space.T1_MEMTX.engine == 'memtx')
>  ---
>  - true
>  ...
> -box.execute("pragma sql_default_engine='vinyl'")
> +box.space._session_settings:update('sql_default_engine', {{'=', 2, 'vinyl'}})
>  ---
> -- row_count: 0
> +- ['sql_default_engine', 'vinyl']
>  ...
>  box.execute("CREATE TABLE t2_vinyl (id INT PRIMARY KEY) WITH ENGINE = 'vinyl'")
>  ---
> diff --git a/test/sql/engine.test.lua b/test/sql/engine.test.lua
> index 112d3d3..d71cbc1 100644
> --- a/test/sql/engine.test.lua
> +++ b/test/sql/engine.test.lua
> @@ -1,11 +1,11 @@
>  env = require('test_run')
>  test_run = env.new()
>  
> -box.execute("pragma sql_default_engine='vinyl'")
> +box.space._session_settings:update('sql_default_engine', {{'=', 2, 'vinyl'}})
>  box.execute("CREATE TABLE t1_vinyl(a INT PRIMARY KEY, b INT, c INT);")
>  box.execute("CREATE TABLE t2_vinyl(a INT PRIMARY KEY, b INT, c INT);")
>  
> -box.execute("pragma sql_default_engine='memtx'")
> +box.space._session_settings:update('sql_default_engine', {{'=', 2, 'memtx'}})
>  box.execute("CREATE TABLE t3_memtx(a INT PRIMARY KEY, b INT, c INT);")
>  
>  assert(box.space.T1_VINYL.engine == 'vinyl')
> @@ -22,7 +22,7 @@ box.execute("CREATE TABLE t1_vinyl (id INT PRIMARY KEY) WITH ENGINE = 'vinyl'")
>  assert(box.space.T1_VINYL.engine == 'vinyl')
>  box.execute("CREATE TABLE t1_memtx (id INT PRIMARY KEY) WITH ENGINE = 'memtx'")
>  assert(box.space.T1_MEMTX.engine == 'memtx')
> -box.execute("pragma sql_default_engine='vinyl'")
> +box.space._session_settings:update('sql_default_engine', {{'=', 2, 'vinyl'}})
>  box.execute("CREATE TABLE t2_vinyl (id INT PRIMARY KEY) WITH ENGINE = 'vinyl'")
>  assert(box.space.T2_VINYL.engine == 'vinyl')
>  box.execute("CREATE TABLE t2_memtx (id INT PRIMARY KEY) WITH ENGINE = 'memtx'")
> diff --git a/test/sql/errinj.result b/test/sql/errinj.result
> index 7ab522f..68c001f 100644
> --- a/test/sql/errinj.result
> +++ b/test/sql/errinj.result
> @@ -7,9 +7,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  errinj = box.error.injection
>  ---
> diff --git a/test/sql/errinj.test.lua b/test/sql/errinj.test.lua
> index b978767..72e96a9 100644
> --- a/test/sql/errinj.test.lua
> +++ b/test/sql/errinj.test.lua
> @@ -1,7 +1,7 @@
>  remote = require('net.box')
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  errinj = box.error.injection
>  fiber = require('fiber')
>  
> diff --git a/test/sql/full_metadata.result b/test/sql/full_metadata.result
> index 4631080..e4ea626 100644
> --- a/test/sql/full_metadata.result
> +++ b/test/sql/full_metadata.result
> @@ -46,9 +46,9 @@ test_run:cmd("setopt delimiter ''");
>   | - true
>   | ...
>  
> -execute("PRAGMA full_metadata = true;")
> +execute([[UPDATE "_session_settings" SET "value" = true WHERE "name" = 'sql_full_metadata';]])
>   | ---
> - | - row_count: 0
> + | - row_count: 1
>   | ...
>  -- Make sure collation is presented in extended metadata.
>  --
> @@ -118,9 +118,9 @@ execute("SELECT * FROM t;")
>   |   - [1, 1, 'aSd']
>   | ...
>  
> -execute("PRAGMA full_metadata = false;")
> +execute([[UPDATE "_session_settings" SET "value" = false WHERE "name" = 'sql_full_metadata';]])
>   | ---
> - | - row_count: 0
> + | - row_count: 1
>   | ...
>  
>  test_run:cmd("setopt delimiter ';'")
> diff --git a/test/sql/full_metadata.test.lua b/test/sql/full_metadata.test.lua
> index e3b30f7..a9d3771 100644
> --- a/test/sql/full_metadata.test.lua
> +++ b/test/sql/full_metadata.test.lua
> @@ -23,7 +23,7 @@ else
>  end;
>  test_run:cmd("setopt delimiter ''");
>  
> -execute("PRAGMA full_metadata = true;")
> +execute([[UPDATE "_session_settings" SET "value" = true WHERE "name" = 'sql_full_metadata';]])
>  -- Make sure collation is presented in extended metadata.
>  --
>  execute("SELECT 'aSd' COLLATE \"unicode_ci\";")
> @@ -35,7 +35,7 @@ execute("SELECT c COLLATE \"unicode\" FROM t;")
>  execute("SELECT id, a, c FROM t;")
>  execute("SELECT * FROM t;")
>  
> -execute("PRAGMA full_metadata = false;")
> +execute([[UPDATE "_session_settings" SET "value" = false WHERE "name" = 'sql_full_metadata';]])
>  
>  test_run:cmd("setopt delimiter ';'")
>  if remote then
> diff --git a/test/sql/func-recreate.result b/test/sql/func-recreate.result
> index a0a67a1..3709df7 100644
> --- a/test/sql/func-recreate.result
> +++ b/test/sql/func-recreate.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- Check errors during function create process
>  fiber = require('fiber')
> diff --git a/test/sql/func-recreate.test.lua b/test/sql/func-recreate.test.lua
> index 0b32ea9..b76789f 100644
> --- a/test/sql/func-recreate.test.lua
> +++ b/test/sql/func-recreate.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- Check errors during function create process
>  fiber = require('fiber')
> diff --git a/test/sql/gh-2362-select-access-rights.result b/test/sql/gh-2362-select-access-rights.result
> index b15b0da..5ac82b1 100644
> --- a/test/sql/gh-2362-select-access-rights.result
> +++ b/test/sql/gh-2362-select-access-rights.result
> @@ -4,12 +4,11 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -nb = require('net.box')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
>  ...
> -box.execute("PRAGMA sql_default_engine='"..engine.."'")
> +nb = require('net.box')
>  ---
> -- row_count: 0
>  ...
>  box.execute("CREATE TABLE t1 (s1 INT PRIMARY KEY, s2 INT UNIQUE);")
>  ---
> diff --git a/test/sql/gh-2362-select-access-rights.test.lua b/test/sql/gh-2362-select-access-rights.test.lua
> index f2b66b6..3409dcd 100644
> --- a/test/sql/gh-2362-select-access-rights.test.lua
> +++ b/test/sql/gh-2362-select-access-rights.test.lua
> @@ -1,8 +1,8 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  nb = require('net.box')
>  
> -box.execute("PRAGMA sql_default_engine='"..engine.."'")
>  box.execute("CREATE TABLE t1 (s1 INT PRIMARY KEY, s2 INT UNIQUE);")
>  box.execute("CREATE TABLE t2 (s1 INT PRIMARY KEY);")
>  box.execute("INSERT INTO t1 VALUES (1, 1);")
> diff --git a/test/sql/gh-2929-primary-key.result b/test/sql/gh-2929-primary-key.result
> index 021d037..263b89d 100644
> --- a/test/sql/gh-2929-primary-key.result
> +++ b/test/sql/gh-2929-primary-key.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- All tables in SQL are now WITHOUT ROW ID, so if user
>  -- tries to create table without a primary key, an appropriate error message
> diff --git a/test/sql/gh-2929-primary-key.test.lua b/test/sql/gh-2929-primary-key.test.lua
> index 9cc6cd5..935d297 100644
> --- a/test/sql/gh-2929-primary-key.test.lua
> +++ b/test/sql/gh-2929-primary-key.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- All tables in SQL are now WITHOUT ROW ID, so if user
>  -- tries to create table without a primary key, an appropriate error message
> diff --git a/test/sql/gh-2981-check-autoinc.result b/test/sql/gh-2981-check-autoinc.result
> index d2938cd..71c06e5 100644
> --- a/test/sql/gh-2981-check-autoinc.result
> +++ b/test/sql/gh-2981-check-autoinc.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  box.cfg{}
>  ---
> diff --git a/test/sql/gh-2981-check-autoinc.test.lua b/test/sql/gh-2981-check-autoinc.test.lua
> index 0eb8f73..ed60964 100644
> --- a/test/sql/gh-2981-check-autoinc.test.lua
> +++ b/test/sql/gh-2981-check-autoinc.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  box.cfg{}
>  
> diff --git a/test/sql/gh-3199-no-mem-leaks.result b/test/sql/gh-3199-no-mem-leaks.result
> index e7ba1d2..35d8572 100644
> --- a/test/sql/gh-3199-no-mem-leaks.result
> +++ b/test/sql/gh-3199-no-mem-leaks.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  fiber = require('fiber')
>  ---
> diff --git a/test/sql/gh-3199-no-mem-leaks.test.lua b/test/sql/gh-3199-no-mem-leaks.test.lua
> index 54a6ce5..41648d0 100644
> --- a/test/sql/gh-3199-no-mem-leaks.test.lua
> +++ b/test/sql/gh-3199-no-mem-leaks.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  fiber = require('fiber')
>  
>  -- This test checks that no leaks of region memory happens during
> diff --git a/test/sql/gh-3613-idx-alter-update-2.result b/test/sql/gh-3613-idx-alter-update-2.result
> index ff63eb2..86965c4 100644
> --- a/test/sql/gh-3613-idx-alter-update-2.result
> +++ b/test/sql/gh-3613-idx-alter-update-2.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  box.execute('CREATE TABLE t (s1 INT PRIMARY KEY)')
>  ---
> diff --git a/test/sql/gh-3613-idx-alter-update-2.test.lua b/test/sql/gh-3613-idx-alter-update-2.test.lua
> index ff5b651..f67b847 100644
> --- a/test/sql/gh-3613-idx-alter-update-2.test.lua
> +++ b/test/sql/gh-3613-idx-alter-update-2.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  box.execute('CREATE TABLE t (s1 INT PRIMARY KEY)')
>  box.execute('CREATE INDEX i ON t (s1)')
> diff --git a/test/sql/gh-3613-idx-alter-update.result b/test/sql/gh-3613-idx-alter-update.result
> index ba323a6..e8afc4d 100644
> --- a/test/sql/gh-3613-idx-alter-update.result
> +++ b/test/sql/gh-3613-idx-alter-update.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  box.execute('CREATE TABLE t (s1 INT PRIMARY KEY)')
>  ---
> diff --git a/test/sql/gh-3613-idx-alter-update.test.lua b/test/sql/gh-3613-idx-alter-update.test.lua
> index 3027182..56843d3 100644
> --- a/test/sql/gh-3613-idx-alter-update.test.lua
> +++ b/test/sql/gh-3613-idx-alter-update.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  box.execute('CREATE TABLE t (s1 INT PRIMARY KEY)')
>  box.execute('CREATE INDEX i ON t (s1)')
> diff --git a/test/sql/gh-3888-values-blob-assert.result b/test/sql/gh-3888-values-blob-assert.result
> index 2cd6150..0a1af28 100644
> --- a/test/sql/gh-3888-values-blob-assert.result
> +++ b/test/sql/gh-3888-values-blob-assert.result
> @@ -10,9 +10,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- check 'VALUES' against typedef keywords (should fail)
>  box.execute('VALUES(scalar)')
> diff --git a/test/sql/gh-3888-values-blob-assert.test.lua b/test/sql/gh-3888-values-blob-assert.test.lua
> index 0b7c385..497d563 100644
> --- a/test/sql/gh-3888-values-blob-assert.test.lua
> +++ b/test/sql/gh-3888-values-blob-assert.test.lua
> @@ -6,7 +6,7 @@
>  --
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- check 'VALUES' against typedef keywords (should fail)
>  box.execute('VALUES(scalar)')
> diff --git a/test/sql/gh2141-delete-trigger-drop-table.result b/test/sql/gh2141-delete-trigger-drop-table.result
> index 1d373f5..f8981e4 100644
> --- a/test/sql/gh2141-delete-trigger-drop-table.result
> +++ b/test/sql/gh2141-delete-trigger-drop-table.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- create space
>  box.execute("CREATE TABLE t(id INT PRIMARY KEY)")
> diff --git a/test/sql/gh2141-delete-trigger-drop-table.test.lua b/test/sql/gh2141-delete-trigger-drop-table.test.lua
> index 4d21fd7..904b52e 100644
> --- a/test/sql/gh2141-delete-trigger-drop-table.test.lua
> +++ b/test/sql/gh2141-delete-trigger-drop-table.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- create space
>  box.execute("CREATE TABLE t(id INT PRIMARY KEY)")
> diff --git a/test/sql/gh2251-multiple-update.result b/test/sql/gh2251-multiple-update.result
> index 42ebf7f..f3658ed 100644
> --- a/test/sql/gh2251-multiple-update.result
> +++ b/test/sql/gh2251-multiple-update.result
> @@ -5,9 +5,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- box.cfg()
>  box.execute("CREATE TABLE t1(a integer primary key, b INT UNIQUE, e INT);")
> diff --git a/test/sql/gh2251-multiple-update.test.lua b/test/sql/gh2251-multiple-update.test.lua
> index 4d55096..2d0e07d 100644
> --- a/test/sql/gh2251-multiple-update.test.lua
> +++ b/test/sql/gh2251-multiple-update.test.lua
> @@ -1,7 +1,7 @@
>  -- Regression test for #2251
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- box.cfg()
>  
> diff --git a/test/sql/gh2483-remote-persistency-check.result b/test/sql/gh2483-remote-persistency-check.result
> index d69fcbd..3ee49b3 100644
> --- a/test/sql/gh2483-remote-persistency-check.result
> +++ b/test/sql/gh2483-remote-persistency-check.result
> @@ -8,9 +8,8 @@ test_run = env.new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  box.schema.user.grant('guest', 'read,write,execute', 'universe')
>  ---
> diff --git a/test/sql/gh2483-remote-persistency-check.test.lua b/test/sql/gh2483-remote-persistency-check.test.lua
> index 7db1602..b36b402 100644
> --- a/test/sql/gh2483-remote-persistency-check.test.lua
> +++ b/test/sql/gh2483-remote-persistency-check.test.lua
> @@ -2,7 +2,7 @@
>  env = require('test_run')
>  test_run = env.new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  box.schema.user.grant('guest', 'read,write,execute', 'universe')
>  
> diff --git a/test/sql/gh2808-inline-unique-persistency-check.result b/test/sql/gh2808-inline-unique-persistency-check.result
> index a277b3f..b84925c 100644
> --- a/test/sql/gh2808-inline-unique-persistency-check.result
> +++ b/test/sql/gh2808-inline-unique-persistency-check.result
> @@ -8,9 +8,8 @@ test_run = env.new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- Create a table and insert a datum
>  box.execute([[CREATE TABLE t1(a INT PRIMARY KEY, b INT, UNIQUE(b));]])
> diff --git a/test/sql/gh2808-inline-unique-persistency-check.test.lua b/test/sql/gh2808-inline-unique-persistency-check.test.lua
> index 26b646a..bbffc92 100644
> --- a/test/sql/gh2808-inline-unique-persistency-check.test.lua
> +++ b/test/sql/gh2808-inline-unique-persistency-check.test.lua
> @@ -2,7 +2,7 @@
>  env = require('test_run')
>  test_run = env.new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- Create a table and insert a datum
>  box.execute([[CREATE TABLE t1(a INT PRIMARY KEY, b INT, UNIQUE(b));]])
> diff --git a/test/sql/icu-upper-lower.result b/test/sql/icu-upper-lower.result
> index 8ff7528..f7b9dfa 100644
> --- a/test/sql/icu-upper-lower.result
> +++ b/test/sql/icu-upper-lower.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  test_run:cmd("setopt delimiter ';'")
>  ---
> diff --git a/test/sql/icu-upper-lower.test.lua b/test/sql/icu-upper-lower.test.lua
> index 00e9699..f358733 100644
> --- a/test/sql/icu-upper-lower.test.lua
> +++ b/test/sql/icu-upper-lower.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  test_run:cmd("setopt delimiter ';'")
>  
> diff --git a/test/sql/insert-unique.result b/test/sql/insert-unique.result
> index 1cf44c9..ff2930e 100644
> --- a/test/sql/insert-unique.result
> +++ b/test/sql/insert-unique.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- box.cfg()
>  -- create space
> @@ -18,8 +17,6 @@ box.execute("CREATE UNIQUE INDEX zoobar2 ON zoobar(c1, c4)")
>  ---
>  - row_count: 1
>  ...
> --- Debug
> --- box.execute("PRAGMA vdbe_debug=ON ; INSERT INTO zoobar VALUES (111, 222, 'c3', 444)")
>  -- Seed entry
>  box.execute("INSERT INTO zoobar VALUES (111, 222, 'c3', 444)")
>  ---
> diff --git a/test/sql/insert-unique.test.lua b/test/sql/insert-unique.test.lua
> index 026bc9d..2c1214a 100644
> --- a/test/sql/insert-unique.test.lua
> +++ b/test/sql/insert-unique.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- box.cfg()
>  
> @@ -8,9 +8,6 @@ box.execute('pragma sql_default_engine=\''..engine..'\'')
>  box.execute("CREATE TABLE zoobar (c1 INT, c2 INT PRIMARY KEY, c3 TEXT, c4 INT)")
>  box.execute("CREATE UNIQUE INDEX zoobar2 ON zoobar(c1, c4)")
>  
> --- Debug
> --- box.execute("PRAGMA vdbe_debug=ON ; INSERT INTO zoobar VALUES (111, 222, 'c3', 444)")
> -
>  -- Seed entry
>  box.execute("INSERT INTO zoobar VALUES (111, 222, 'c3', 444)")
>  
> diff --git a/test/sql/integer-overflow.result b/test/sql/integer-overflow.result
> index d6223ff..db5c2f7 100644
> --- a/test/sql/integer-overflow.result
> +++ b/test/sql/integer-overflow.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- gh-3735: make sure that integer overflows errors are
>  -- handled during VDBE execution.
> diff --git a/test/sql/integer-overflow.test.lua b/test/sql/integer-overflow.test.lua
> index 17051f9..2ac9799 100644
> --- a/test/sql/integer-overflow.test.lua
> +++ b/test/sql/integer-overflow.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- gh-3735: make sure that integer overflows errors are
>  -- handled during VDBE execution.
> diff --git a/test/sql/iproto.result b/test/sql/iproto.result
> index 3240c2b..9f67df9 100644
> --- a/test/sql/iproto.result
> +++ b/test/sql/iproto.result
> @@ -7,9 +7,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  box.execute('create table test (id int primary key, a NUMBER, b text)')
>  ---
> diff --git a/test/sql/iproto.test.lua b/test/sql/iproto.test.lua
> index b5ec2c0..4019fb7 100644
> --- a/test/sql/iproto.test.lua
> +++ b/test/sql/iproto.test.lua
> @@ -1,7 +1,7 @@
>  remote = require('net.box')
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  box.execute('create table test (id int primary key, a NUMBER, b text)')
>  space = box.space.TEST
> diff --git a/test/sql/max-on-index.result b/test/sql/max-on-index.result
> index 57ce95b..1cd488f 100644
> --- a/test/sql/max-on-index.result
> +++ b/test/sql/max-on-index.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- box.cfg()
>  -- create space
> @@ -24,8 +23,6 @@ box.execute("CREATE TABLE test2 (f1 INT, f2 INT, PRIMARY KEY(f1))")
>  ---
>  - row_count: 1
>  ...
> --- Debug
> --- box.execute("PRAGMA vdbe_debug=ON ; INSERT INTO zoobar VALUES (111, 222, 'c3', 444)")
>  -- Seed entries
>  box.execute("INSERT INTO test1 VALUES(1, 2)");
>  ---
> diff --git a/test/sql/max-on-index.test.lua b/test/sql/max-on-index.test.lua
> index 4cceaa7..912602e 100644
> --- a/test/sql/max-on-index.test.lua
> +++ b/test/sql/max-on-index.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- box.cfg()
>  
> @@ -12,9 +12,6 @@ box.execute("CREATE INDEX test1_index ON test1 (f2)")
>  -- integer affinity
>  box.execute("CREATE TABLE test2 (f1 INT, f2 INT, PRIMARY KEY(f1))")
>  
> --- Debug
> --- box.execute("PRAGMA vdbe_debug=ON ; INSERT INTO zoobar VALUES (111, 222, 'c3', 444)")
> -
>  -- Seed entries
>  box.execute("INSERT INTO test1 VALUES(1, 2)");
>  box.execute("INSERT INTO test1 VALUES(2, NULL)");
> diff --git a/test/sql/message-func-indexes.result b/test/sql/message-func-indexes.result
> index 69e3ee0..002dbd8 100644
> --- a/test/sql/message-func-indexes.result
> +++ b/test/sql/message-func-indexes.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- Creating tables.
>  box.execute("CREATE TABLE t1(id INTEGER PRIMARY KEY, a INTEGER)")
> diff --git a/test/sql/message-func-indexes.test.lua b/test/sql/message-func-indexes.test.lua
> index 9ac5f47..3cbfe3e 100644
> --- a/test/sql/message-func-indexes.test.lua
> +++ b/test/sql/message-func-indexes.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- Creating tables.
>  box.execute("CREATE TABLE t1(id INTEGER PRIMARY KEY, a INTEGER)")
> diff --git a/test/sql/misc.result b/test/sql/misc.result
> index 050d378..0190a58 100644
> --- a/test/sql/misc.result
> +++ b/test/sql/misc.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- Forbid multistatement queries.
>  box.execute('select 1;')
> diff --git a/test/sql/misc.test.lua b/test/sql/misc.test.lua
> index 541660c..6324422 100644
> --- a/test/sql/misc.test.lua
> +++ b/test/sql/misc.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- Forbid multistatement queries.
>  box.execute('select 1;')
> diff --git a/test/sql/no-pk-space.result b/test/sql/no-pk-space.result
> index 025f363..12f2407 100644
> --- a/test/sql/no-pk-space.result
> +++ b/test/sql/no-pk-space.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  format = {}
>  ---
> diff --git a/test/sql/no-pk-space.test.lua b/test/sql/no-pk-space.test.lua
> index 318c2ac..d7f9479 100644
> --- a/test/sql/no-pk-space.test.lua
> +++ b/test/sql/no-pk-space.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  format = {}
>  format[1] = {'id', 'integer'}
> diff --git a/test/sql/on-conflict.result b/test/sql/on-conflict.result
> index d5a6938..ab6e4f4 100644
> --- a/test/sql/on-conflict.result
> +++ b/test/sql/on-conflict.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  --
>  -- Check that original sql ON CONFLICT clause is really
> diff --git a/test/sql/on-conflict.test.lua b/test/sql/on-conflict.test.lua
> index 1aa4d1b..ec85fe2 100644
> --- a/test/sql/on-conflict.test.lua
> +++ b/test/sql/on-conflict.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  --
>  -- Check that original sql ON CONFLICT clause is really
>  -- disabled.
> diff --git a/test/sql/persistency.result b/test/sql/persistency.result
> index f8f992c..6d14d4c 100644
> --- a/test/sql/persistency.result
> +++ b/test/sql/persistency.result
> @@ -7,9 +7,8 @@ test_run = env.new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- create space
>  box.execute("CREATE TABLE foobar (foo INT PRIMARY KEY, bar TEXT)")
> diff --git a/test/sql/persistency.test.lua b/test/sql/persistency.test.lua
> index 1964453..fdd0bb6 100644
> --- a/test/sql/persistency.test.lua
> +++ b/test/sql/persistency.test.lua
> @@ -1,7 +1,7 @@
>  env = require('test_run')
>  test_run = env.new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- create space
>  box.execute("CREATE TABLE foobar (foo INT PRIMARY KEY, bar TEXT)")
> diff --git a/test/sql/row-count.result b/test/sql/row-count.result
> index 6bf74ed..02acd79 100644
> --- a/test/sql/row-count.result
> +++ b/test/sql/row-count.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- Test cases concerning row count calculations.
>  --
> @@ -314,13 +313,9 @@ box.execute("SELECT ROW_COUNT();")
>    rows:
>    - [0]
>  ...
> -box.execute('PRAGMA recursive_triggers')
> +box.space._session_settings:get('sql_recursive_triggers')
>  ---
> -- metadata:
> -  - name: recursive_triggers
> -    type: integer
> -  rows:
> -  - [1]
> +- ['sql_recursive_triggers', true]
>  ...
>  -- Clean-up.
>  --
> diff --git a/test/sql/row-count.test.lua b/test/sql/row-count.test.lua
> index 369e7fa..d381672 100644
> --- a/test/sql/row-count.test.lua
> +++ b/test/sql/row-count.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- Test cases concerning row count calculations.
>  --
> @@ -65,7 +65,7 @@ box.execute("SELECT ROW_COUNT();")
>  box.execute("SELECT ROW_COUNT();")
>  box.execute("EXPLAIN QUERY PLAN INSERT INTO t1 VALUES ('b'), ('c'), ('d');")
>  box.execute("SELECT ROW_COUNT();")
> -box.execute('PRAGMA recursive_triggers')
> +box.space._session_settings:get('sql_recursive_triggers')
>  
>  -- Clean-up.
>  --
> diff --git a/test/sql/savepoints.result b/test/sql/savepoints.result
> index e48db30..509c33e 100644
> --- a/test/sql/savepoints.result
> +++ b/test/sql/savepoints.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- These tests check that SQL savepoints properly work outside
>  -- transactions as well as inside transactions started in Lua.
> diff --git a/test/sql/savepoints.test.lua b/test/sql/savepoints.test.lua
> index 99622a4..f1b15c7 100644
> --- a/test/sql/savepoints.test.lua
> +++ b/test/sql/savepoints.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- These tests check that SQL savepoints properly work outside
>  -- transactions as well as inside transactions started in Lua.
> diff --git a/test/sql/select-null.result b/test/sql/select-null.result
> index 83d9776..5bd46cd 100644
> --- a/test/sql/select-null.result
> +++ b/test/sql/select-null.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- box.cfg()
>  -- create space
> @@ -14,8 +13,6 @@ box.execute("CREATE TABLE t3(id INT, a text, b TEXT, PRIMARY KEY(id))")
>  ---
>  - row_count: 1
>  ...
> --- Debug
> --- box.execute("PRAGMA vdbe_debug=ON ; INSERT INTO zoobar VALUES (111, 222, 'c3', 444)")
>  -- Seed entries
>  box.execute("INSERT INTO t3 VALUES(1, 'abc',NULL)");
>  ---
> diff --git a/test/sql/select-null.test.lua b/test/sql/select-null.test.lua
> index a49eb43..2ce964d 100644
> --- a/test/sql/select-null.test.lua
> +++ b/test/sql/select-null.test.lua
> @@ -1,15 +1,12 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- box.cfg()
>  
>  -- create space
>  box.execute("CREATE TABLE t3(id INT, a text, b TEXT, PRIMARY KEY(id))")
>  
> --- Debug
> --- box.execute("PRAGMA vdbe_debug=ON ; INSERT INTO zoobar VALUES (111, 222, 'c3', 444)")
> -
>  -- Seed entries
>  box.execute("INSERT INTO t3 VALUES(1, 'abc',NULL)");
>  box.execute("INSERT INTO t3 VALUES(2, NULL,'xyz')");
> diff --git a/test/sql/sql-debug.result b/test/sql/sql-debug.result
> deleted file mode 100644
> index ce87f11..0000000
> --- a/test/sql/sql-debug.result
> +++ /dev/null
> @@ -1,55 +0,0 @@
> -remote = require('net.box')
> ----
> -...
> -test_run = require('test_run').new()
> ----
> -...
> ---
> --- gh-3832: Some statements do not return column type
> --- Check that "PRAGMA parser_trace" returns 0 or 1 if called
> --- without parameter.
> -result = box.execute('PRAGMA parser_trace').rows
> ----
> -...
> -box.execute('PRAGMA parser_trace = 1')
> ----
> -- row_count: 0
> -...
> -box.execute('PRAGMA parser_trace')
> ----
> -- metadata:
> -  - name: parser_trace
> -    type: integer
> -  rows:
> -  - [1]
> -...
> -box.execute('PRAGMA parser_trace = '.. result[1][1])
> ----
> -- row_count: 0
> -...
> ---
> --- Make PRAGMA command return the result as a result set.
> ---
> -box.execute('PRAGMA')
> ----
> -- metadata:
> -  - name: pragma_name
> -    type: text
> -  - name: pragma_value
> -    type: integer
> -  rows:
> -  - ['defer_foreign_keys', 0]
> -  - ['full_column_names', 0]
> -  - ['full_metadata', 0]
> -  - ['parser_trace', 0]
> -  - ['recursive_triggers', 1]
> -  - ['reverse_unordered_selects', 0]
> -  - ['select_trace', 0]
> -  - ['sql_trace', 0]
> -  - ['vdbe_addoptrace', 0]
> -  - ['vdbe_debug', 0]
> -  - ['vdbe_eqp', 0]
> -  - ['vdbe_listing', 0]
> -  - ['vdbe_trace', 0]
> -  - ['where_trace', 0]
> -...
> diff --git a/test/sql/sql-debug.test.lua b/test/sql/sql-debug.test.lua
> deleted file mode 100644
> index edd0ef4..0000000
> --- a/test/sql/sql-debug.test.lua
> +++ /dev/null
> @@ -1,17 +0,0 @@
> -remote = require('net.box')
> -test_run = require('test_run').new()
> -
> ---
> --- gh-3832: Some statements do not return column type
> -
> --- Check that "PRAGMA parser_trace" returns 0 or 1 if called
> --- without parameter.
> -result = box.execute('PRAGMA parser_trace').rows
> -box.execute('PRAGMA parser_trace = 1')
> -box.execute('PRAGMA parser_trace')
> -box.execute('PRAGMA parser_trace = '.. result[1][1])
> -
> ---
> --- Make PRAGMA command return the result as a result set.
> ---
> -box.execute('PRAGMA')
> diff --git a/test/sql/sql-statN-index-drop.test.lua b/test/sql/sql-statN-index-drop.test.lua
> index 5477a2a..7e3a04e 100644
> --- a/test/sql/sql-statN-index-drop.test.lua
> +++ b/test/sql/sql-statN-index-drop.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- Initializing some things.
>  box.execute("CREATE TABLE t1(id INT PRIMARY KEY, a INT);")
> diff --git a/test/sql/suite.ini b/test/sql/suite.ini
> index a8664c5..57e78f1 100644
> --- a/test/sql/suite.ini
> +++ b/test/sql/suite.ini
> @@ -7,7 +7,7 @@ use_unix_sockets_iproto = True
>  config = engine.cfg
>  is_parallel = True
>  lua_libs = lua/sql_tokenizer.lua
> -release_disabled = errinj.test.lua view_delayed_wal.test.lua sql-debug.test.lua
> +release_disabled = errinj.test.lua view_delayed_wal.test.lua
>  disabled = sql-statN-index-drop.test.lua
>  pretest_clean = True
>  fragile = dll.test.lua           ; gh-4427
> diff --git a/test/sql/tokenizer.result b/test/sql/tokenizer.result
> index 1ae9ef2..d127bd0 100644
> --- a/test/sql/tokenizer.result
> +++ b/test/sql/tokenizer.result
> @@ -7,9 +7,8 @@ test_run = env.new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  sql_tokenizer = require('sql_tokenizer')
>  ---
> diff --git a/test/sql/tokenizer.test.lua b/test/sql/tokenizer.test.lua
> index 3f5dd12..39fdf1f 100644
> --- a/test/sql/tokenizer.test.lua
> +++ b/test/sql/tokenizer.test.lua
> @@ -1,7 +1,7 @@
>  env = require('test_run')
>  test_run = env.new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  sql_tokenizer = require('sql_tokenizer')
>  
> diff --git a/test/sql/transition.result b/test/sql/transition.result
> index 9738092..c14055b 100644
> --- a/test/sql/transition.result
> +++ b/test/sql/transition.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- create space
>  box.execute("CREATE TABLE foobar (foo INT PRIMARY KEY, bar TEXT)")
> diff --git a/test/sql/transition.test.lua b/test/sql/transition.test.lua
> index a05c26a..053a3cd 100644
> --- a/test/sql/transition.test.lua
> +++ b/test/sql/transition.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- create space
>  box.execute("CREATE TABLE foobar (foo INT PRIMARY KEY, bar TEXT)")
> diff --git a/test/sql/transitive-transactions.result b/test/sql/transitive-transactions.result
> index 29c7316..91c35a3 100644
> --- a/test/sql/transitive-transactions.result
> +++ b/test/sql/transitive-transactions.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute("pragma sql_default_engine=\'"..engine.."\'")
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  test_run:cmd("setopt delimiter ';'")
>  ---
> @@ -88,7 +87,7 @@ box.space.PARENT:select();
>  ---
>  - - [1, 1]
>  ...
> --- Make sure that 'PRAGMA defer_foreign_keys' works.
> +-- Make sure that setting 'defer_foreign_keys' works.
>  --
>  box.execute('DROP TABLE child;')
>  box.execute('CREATE TABLE child(id INT PRIMARY KEY, x INT REFERENCES parent(y))')
> @@ -116,7 +115,7 @@ box.space.PARENT:select();
>  ---
>  - - [1, 1]
>  ...
> -box.execute('PRAGMA defer_foreign_keys = 1;')
> +box.space._session_settings:update('sql_defer_foreign_keys', {{'=', 2, true}})
>  box.rollback()
>  fk_defer();
>  ---
> @@ -131,7 +130,7 @@ box.space.PARENT:select();
>    - [2, 2]
>  ...
>  -- Cleanup
> -box.execute('PRAGMA defer_foreign_keys = 0;')
> +box.space._session_settings:update('sql_defer_foreign_keys', {{'=', 2, false}})
>  
>  box.execute('DROP TABLE child;');
>  ---
> diff --git a/test/sql/transitive-transactions.test.lua b/test/sql/transitive-transactions.test.lua
> index 4633f07..5565de7 100644
> --- a/test/sql/transitive-transactions.test.lua
> +++ b/test/sql/transitive-transactions.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute("pragma sql_default_engine=\'"..engine.."\'")
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  test_run:cmd("setopt delimiter ';'")
>  
>  -- These tests are aimed at checking transitive transactions
> @@ -45,7 +45,7 @@ fk_violation_3();
>  box.space.CHILD:select();
>  box.space.PARENT:select();
>  
> --- Make sure that 'PRAGMA defer_foreign_keys' works.
> +-- Make sure that setting 'defer_foreign_keys' works.
>  --
>  box.execute('DROP TABLE child;')
>  box.execute('CREATE TABLE child(id INT PRIMARY KEY, x INT REFERENCES parent(y))')
> @@ -62,13 +62,12 @@ end;
>  fk_defer();
>  box.space.CHILD:select();
>  box.space.PARENT:select();
> -box.execute('PRAGMA defer_foreign_keys = 1;')
> +box.space._session_settings:update('sql_defer_foreign_keys', {{'=', 2, true}})
>  box.rollback()
>  fk_defer();
>  box.space.CHILD:select();
>  box.space.PARENT:select();
> -
> -box.execute('PRAGMA defer_foreign_keys = 0;')
> +box.space._session_settings:update('sql_defer_foreign_keys', {{'=', 2, false}})
>  
>  -- Cleanup
>  box.execute('DROP TABLE child;');
> diff --git a/test/sql/triggers.result b/test/sql/triggers.result
> index 7611ea9..ceecb8e 100644
> --- a/test/sql/triggers.result
> +++ b/test/sql/triggers.result
> @@ -7,9 +7,8 @@ test_run = env.new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- Get invariant part of the tuple; name and opts don't change.
>   function immutable_part(data) local r = {} for i, l in pairs(data) do table.insert(r, {l.name, l.opts}) end return r end
> @@ -292,9 +291,9 @@ box.execute("DROP TABLE T1;")
>  -- gh-3531: Assertion with trigger and two storage engines
>  --
>  -- Case 1: Src 'vinyl' table; Dst 'memtx' table
> -box.execute("PRAGMA sql_default_engine ('vinyl');")
> +box.space._session_settings:update('sql_default_engine', {{'=', 2, 'vinyl'}})
>  ---
> -- row_count: 0
> +- ['sql_default_engine', 'vinyl']
>  ...
>  box.execute("CREATE TABLE m (s0 INT PRIMARY KEY, s1 TEXT UNIQUE);")
>  ---
> @@ -304,9 +303,9 @@ box.execute("CREATE TRIGGER m1 BEFORE UPDATE ON m FOR EACH ROW BEGIN UPDATE n SE
>  ---
>  - row_count: 1
>  ...
> -box.execute("PRAGMA sql_default_engine('memtx');")
> +box.space._session_settings:update('sql_default_engine', {{'=', 2, 'memtx'}})
>  ---
> -- row_count: 0
> +- ['sql_default_engine', 'memtx']
>  ...
>  box.execute("CREATE TABLE n (s0 INT PRIMARY KEY, s1 TEXT UNIQUE, s2 NUMBER);")
>  ---
> @@ -336,9 +335,9 @@ box.execute("DROP TABLE n;")
>  - row_count: 1
>  ...
>  -- Case 2: Src 'memtx' table; Dst 'vinyl' table
> -box.execute("PRAGMA sql_default_engine ('memtx');")
> +box.space._session_settings:update('sql_default_engine', {{'=', 2, 'memtx'}})
>  ---
> -- row_count: 0
> +- ['sql_default_engine', 'memtx']
>  ...
>  box.execute("CREATE TABLE m (s0 INT PRIMARY KEY, s1 TEXT UNIQUE);")
>  ---
> @@ -348,9 +347,9 @@ box.execute("CREATE TRIGGER m1 BEFORE UPDATE ON m FOR EACH ROW BEGIN UPDATE n SE
>  ---
>  - row_count: 1
>  ...
> -box.execute("PRAGMA sql_default_engine('vinyl');")
> +box.space._session_settings:update('sql_default_engine', {{'=', 2, 'vinyl'}})
>  ---
> -- row_count: 0
> +- ['sql_default_engine', 'vinyl']
>  ...
>  box.execute("CREATE TABLE n (s0 INT PRIMARY KEY, s1 TEXT UNIQUE, s2 NUMBER);")
>  ---
> @@ -380,17 +379,17 @@ box.execute("DROP TABLE n;")
>  - row_count: 1
>  ...
>  -- Test SQL Transaction with LUA
> -box.execute("PRAGMA sql_default_engine ('memtx');")
> +box.space._session_settings:update('sql_default_engine', {{'=', 2, 'memtx'}})
>  ---
> -- row_count: 0
> +- ['sql_default_engine', 'memtx']
>  ...
>  box.execute("CREATE TABLE test (id INT PRIMARY KEY)")
>  ---
>  - row_count: 1
>  ...
> -box.execute("PRAGMA sql_default_engine='vinyl'")
> +box.space._session_settings:update('sql_default_engine', {{'=', 2, 'vinyl'}})
>  ---
> -- row_count: 0
> +- ['sql_default_engine', 'vinyl']
>  ...
>  box.execute("CREATE TABLE test2 (id INT PRIMARY KEY)")
>  ---
> diff --git a/test/sql/triggers.test.lua b/test/sql/triggers.test.lua
> index f0397dc..f5c8a39 100644
> --- a/test/sql/triggers.test.lua
> +++ b/test/sql/triggers.test.lua
> @@ -1,7 +1,7 @@
>  env = require('test_run')
>  test_run = env.new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- Get invariant part of the tuple; name and opts don't change.
>   function immutable_part(data) local r = {} for i, l in pairs(data) do table.insert(r, {l.name, l.opts}) end return r end
> @@ -100,10 +100,10 @@ box.execute("DROP TABLE T1;")
>  -- gh-3531: Assertion with trigger and two storage engines
>  --
>  -- Case 1: Src 'vinyl' table; Dst 'memtx' table
> -box.execute("PRAGMA sql_default_engine ('vinyl');")
> +box.space._session_settings:update('sql_default_engine', {{'=', 2, 'vinyl'}})
>  box.execute("CREATE TABLE m (s0 INT PRIMARY KEY, s1 TEXT UNIQUE);")
>  box.execute("CREATE TRIGGER m1 BEFORE UPDATE ON m FOR EACH ROW BEGIN UPDATE n SET s2 = 'now'; END;")
> -box.execute("PRAGMA sql_default_engine('memtx');")
> +box.space._session_settings:update('sql_default_engine', {{'=', 2, 'memtx'}})
>  box.execute("CREATE TABLE n (s0 INT PRIMARY KEY, s1 TEXT UNIQUE, s2 NUMBER);")
>  box.execute("INSERT INTO m VALUES (0, '0');")
>  box.execute("INSERT INTO n VALUES (0, '',null);")
> @@ -116,10 +116,10 @@ box.execute("DROP TABLE n;")
>  
>  
>  -- Case 2: Src 'memtx' table; Dst 'vinyl' table
> -box.execute("PRAGMA sql_default_engine ('memtx');")
> +box.space._session_settings:update('sql_default_engine', {{'=', 2, 'memtx'}})
>  box.execute("CREATE TABLE m (s0 INT PRIMARY KEY, s1 TEXT UNIQUE);")
>  box.execute("CREATE TRIGGER m1 BEFORE UPDATE ON m FOR EACH ROW BEGIN UPDATE n SET s2 = 'now'; END;")
> -box.execute("PRAGMA sql_default_engine('vinyl');")
> +box.space._session_settings:update('sql_default_engine', {{'=', 2, 'vinyl'}})
>  box.execute("CREATE TABLE n (s0 INT PRIMARY KEY, s1 TEXT UNIQUE, s2 NUMBER);")
>  box.execute("INSERT INTO m VALUES (0, '0');")
>  box.execute("INSERT INTO n VALUES (0, '',null);")
> @@ -131,9 +131,9 @@ box.execute("DROP TABLE m;")
>  box.execute("DROP TABLE n;")
>  
>  -- Test SQL Transaction with LUA
> -box.execute("PRAGMA sql_default_engine ('memtx');")
> +box.space._session_settings:update('sql_default_engine', {{'=', 2, 'memtx'}})
>  box.execute("CREATE TABLE test (id INT PRIMARY KEY)")
> -box.execute("PRAGMA sql_default_engine='vinyl'")
> +box.space._session_settings:update('sql_default_engine', {{'=', 2, 'vinyl'}})
>  box.execute("CREATE TABLE test2 (id INT PRIMARY KEY)")
>  box.execute("INSERT INTO test2 VALUES (2)")
>  box.execute("START TRANSACTION")
> diff --git a/test/sql/update-with-nested-select.result b/test/sql/update-with-nested-select.result
> index 3172430..2b6525e 100644
> --- a/test/sql/update-with-nested-select.result
> +++ b/test/sql/update-with-nested-select.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- box.cfg()
>  -- create space
> @@ -14,8 +13,6 @@ box.execute("CREATE TABLE t1(a integer primary key, b INT UNIQUE, e INT);");
>  ---
>  - row_count: 1
>  ...
> --- Debug
> --- box.execute("PRAGMA vdbe_debug=ON ; INSERT INTO zoobar VALUES (111, 222, 'c3', 444)")
>  -- Seed entries
>  box.execute("INSERT INTO t1 VALUES(1,4,6);");
>  ---
> diff --git a/test/sql/update-with-nested-select.test.lua b/test/sql/update-with-nested-select.test.lua
> index 88424fc..631ce3566 100644
> --- a/test/sql/update-with-nested-select.test.lua
> +++ b/test/sql/update-with-nested-select.test.lua
> @@ -1,15 +1,12 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- box.cfg()
>  
>  -- create space
>  box.execute("CREATE TABLE t1(a integer primary key, b INT UNIQUE, e INT);");
>  
> --- Debug
> --- box.execute("PRAGMA vdbe_debug=ON ; INSERT INTO zoobar VALUES (111, 222, 'c3', 444)")
> -
>  -- Seed entries
>  box.execute("INSERT INTO t1 VALUES(1,4,6);");
>  box.execute("INSERT INTO t1 VALUES(2,5,7);");
> diff --git a/test/sql/upgrade.result b/test/sql/upgrade.result
> index f0997e1..8803d2d 100644
> --- a/test/sql/upgrade.result
> +++ b/test/sql/upgrade.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  work_dir = 'sql/upgrade/1.10/'
>  ---
> diff --git a/test/sql/upgrade.test.lua b/test/sql/upgrade.test.lua
> index 37425ae..ad3b20e 100644
> --- a/test/sql/upgrade.test.lua
> +++ b/test/sql/upgrade.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  work_dir = 'sql/upgrade/1.10/'
>  test_run:cmd('create server upgrade with script="sql/upgrade/upgrade.lua", workdir="' .. work_dir .. '"')
> diff --git a/test/sql/view.result b/test/sql/view.result
> index d845df8..f3b4da1 100644
> --- a/test/sql/view.result
> +++ b/test/sql/view.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  -- Verify that constraints on 'view' option are working.
>  -- box.cfg()
> diff --git a/test/sql/view.test.lua b/test/sql/view.test.lua
> index 0008056..76ea303 100644
> --- a/test/sql/view.test.lua
> +++ b/test/sql/view.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  
>  -- Verify that constraints on 'view' option are working.
>  
> diff --git a/test/sql/view_delayed_wal.result b/test/sql/view_delayed_wal.result
> index d518e7d..14f3bff 100644
> --- a/test/sql/view_delayed_wal.result
> +++ b/test/sql/view_delayed_wal.result
> @@ -4,9 +4,8 @@ test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
>  ---
>  ...
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  ---
> -- row_count: 0
>  ...
>  fiber = require('fiber')
>  ---
> diff --git a/test/sql/view_delayed_wal.test.lua b/test/sql/view_delayed_wal.test.lua
> index 7e6fce6..6660fd2 100644
> --- a/test/sql/view_delayed_wal.test.lua
> +++ b/test/sql/view_delayed_wal.test.lua
> @@ -1,6 +1,6 @@
>  test_run = require('test_run').new()
>  engine = test_run:get_cfg('engine')
> -box.execute('pragma sql_default_engine=\''..engine..'\'')
> +_ = box.space._session_settings:update('sql_default_engine', {{'=', 2, engine}})
>  fiber = require('fiber')
>  
>  -- View reference counters are incremented before firing
> diff --git a/test/sql/vinyl-opts.result b/test/sql/vinyl-opts.result
> index 10a649a..4d80245 100644
> --- a/test/sql/vinyl-opts.result
> +++ b/test/sql/vinyl-opts.result
> @@ -13,9 +13,9 @@ test_run:cmd("switch test")
>  ---
>  - true
>  ...
> -box.execute('pragma sql_default_engine= \'vinyl\'')
> +box.space._session_settings:update('sql_default_engine', {{'=', 2, 'vinyl'}})
>  ---
> -- row_count: 0
> +- ['sql_default_engine', 'vinyl']
>  ...
>  box.execute('CREATE TABLE v1 (id INT PRIMARY KEY, b INT);')
>  ---
> diff --git a/test/sql/vinyl-opts.test.lua b/test/sql/vinyl-opts.test.lua
> index 4460724..a0cb775 100644
> --- a/test/sql/vinyl-opts.test.lua
> +++ b/test/sql/vinyl-opts.test.lua
> @@ -3,7 +3,7 @@ test_run:cmd("create server test with script='sql/vinyl-opts-cfg.lua'")
>  test_run:cmd("start server test")
>  test_run:cmd("switch test")
>  
> -box.execute('pragma sql_default_engine= \'vinyl\'')
> +box.space._session_settings:update('sql_default_engine', {{'=', 2, 'vinyl'}})
>  box.execute('CREATE TABLE v1 (id INT PRIMARY KEY, b INT);')
>  box.space.V1.index[0].options
>  


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