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DROP TABLE IF EXISTS t1;
# Checking variables
SHOW VARIABLES LIKE 'innodb_fake_changes';
Variable_name Value
innodb_fake_changes OFF
SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.SESSION_VARIABLES WHERE VARIABLE_NAME='innodb_fake_changes';
VARIABLE_VALUE
OFF
SET innodb_fake_changes=1;
SHOW VARIABLES LIKE 'innodb_fake_changes';
Variable_name Value
innodb_fake_changes ON
SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.SESSION_VARIABLES WHERE VARIABLE_NAME='innodb_fake_changes';
VARIABLE_VALUE
ON
SET innodb_fake_changes=default;
SHOW VARIABLES LIKE 'innodb_fake_changes';
Variable_name Value
innodb_fake_changes OFF
SELECT VARIABLE_VALUE FROM INFORMATION_SCHEMA.SESSION_VARIABLES WHERE VARIABLE_NAME='innodb_fake_changes';
VARIABLE_VALUE
OFF
# Explicit COMMIT should fail when innodb_fake_changes is enabled
# DML should be fine
CREATE TABLE t1 (a INT) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1);
SET autocommit=0;
SET innodb_fake_changes=1;
BEGIN;
INSERT INTO t1 VALUES (2);
UPDATE t1 SET a=0;
DELETE FROM t1 LIMIT 1;
SELECT * FROM t1;
a
1
COMMIT;
ERROR HY000: Got error 131 "Command not supported by database" during COMMIT
SET innodb_fake_changes=default;
DROP TABLE t1;
# DDL must result in error
CREATE TABLE t1 (a INT) ENGINE=InnoDB;
SET autocommit=0;
SET innodb_fake_changes=1;
BEGIN;
CREATE TABLE t2 (a INT) ENGINE=InnoDB;
ERROR HY000: Can't create table `test`.`t2` (errno: 131 "Command not supported by database")
DROP TABLE t1;
ERROR HY000: Storage engine InnoDB of the table `test`.`t1` doesn't have this option
TRUNCATE TABLE t1;
ERROR HY000: Got error 131 "Command not supported by database" during COMMIT
ALTER TABLE t1 ENGINE=MyISAM;
ERROR HY000: Got error 131 "Command not supported by database" during COMMIT
ROLLBACK;
SET innodb_fake_changes=default;
DROP TABLE t1;
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