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Added sys.optimizer_switch_on() and sys.optimizer_switch_off()

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These are helpful tools to quickly see what optimizer switch options
are on or off.  The different options are displayed alphabetically
This commit is contained in:
Monty
2023-01-04 18:52:18 +01:00
parent 356a860155
commit 5de734da6b
5 changed files with 115 additions and 0 deletions
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69
scripts/sys_schema/procedures/optimizer_switch.sql Normal file
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-- Copyright (C) 2023, MariaDB
--
-- This program is free software; you can redistribute it and/or modify
-- it under the terms of the GNU General Public License as published by
-- the Free Software Foundation; version 2 of the License.
--
-- This program is distributed in the hope that it will be useful,
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
-- GNU General Public License for more details.
--
-- You should have received a copy of the GNU General Public License
-- along with this program; if not, write to the Free Software
-- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
DROP PROCEDURE IF EXISTS optimizer_switch_choice;
DROP PROCEDURE IF EXISTS optimizer_switch_on;
DROP PROCEDURE IF EXISTS optimizer_switch_off;
DELIMITER $$
CREATE DEFINER='mariadb.sys'@'localhost' PROCEDURE optimizer_switch_choice(IN on_off VARCHAR(3))
COMMENT 'return @@optimizer_switch options as a result set for easier readability'
SQL SECURITY INVOKER
NOT DETERMINISTIC
CONTAINS SQL
BEGIN
DECLARE tmp VARCHAR(1024);
DECLARE opt VARCHAR(1024);
DECLARE start INT;
DECLARE end INT;
DECLARE pos INT;
set tmp=concat(@@optimizer_switch,",");
CREATE OR REPLACE TEMPORARY TABLE tmp_opt_switch (a varchar(64), opt CHAR(3)) character set latin1 engine=heap;
set start=1;
FIND_OPTIONS:
LOOP
set pos= INSTR(SUBSTR(tmp, start), ",");
if (pos = 0) THEN
LEAVE FIND_OPTIONS;
END IF;
set opt= MID(tmp, start, pos-1);
set end= INSTR(opt, "=");
insert into tmp_opt_switch values(LEFT(opt,end-1),SUBSTR(opt,end+1));
set start=start + pos;
END LOOP;
SELECT t.a as "option",t.opt from tmp_opt_switch as t where t.opt = on_off order by a;
DROP TEMPORARY TABLE tmp_opt_switch;
END$$
CREATE DEFINER='mariadb.sys'@'localhost' PROCEDURE optimizer_switch_on()
COMMENT 'return @@optimizer_switch options that are on'
SQL SECURITY INVOKER
NOT DETERMINISTIC
CONTAINS SQL
BEGIN
call optimizer_switch_choice("on");
END$$
CREATE DEFINER='mariadb.sys'@'localhost' PROCEDURE optimizer_switch_off()
COMMENT 'return @@optimizer_switch options that are off'
SQL SECURITY INVOKER
NOT DETERMINISTIC
CONTAINS SQL
BEGIN
call optimizer_switch_choice("off");
END$$
DELIMITER ;