SELECT @@global.innodb_table_locks into @table_locks;
SET @@global.innodb_table_locks= OFF;
DROP TABLE IF EXISTS t1, t2;
SET autocommit=0;
SET autocommit=0;
connection default;
CREATE TABLE t1 (k INT NOT NULL PRIMARY KEY, i INT, j INT, l INT) ENGINE=InnoDB;
INSERT INTO t1 VALUES (1,123,1,123);
INSERT INTO t1 VALUES (2,124,2,124);
INSERT INTO t1 VALUES (3,125,3,125);
INSERT INTO t1 VALUES (4,126,4,126);
CREATE INDEX ixi ON t1 (i);
CREATE TABLE t2 (k INT NOT NULL PRIMARY KEY, i INT, j INT, l INT) ENGINE=InnoDB;
INSERT INTO t2 VALUES (1,123,1,123);
INSERT INTO t2 VALUES (2,124,2,124);
INSERT INTO t2 VALUES (3,125,3,125);
INSERT INTO t2 VALUES (4,126,4,126);
CREATE INDEX ixi ON t2 (i);
COMMIT;
SELECT @@global.tx_isolation;
@@global.tx_isolation
REPEATABLE-READ
EXPLAIN SELECT t1.i,t2.i FROM t1 ignore index (ixi),t2 IGNORE INDEX (ixi) WHERE t1.i<125 AND t2.i=t1.i LOCK IN SHARE MODE;
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	t1	ALL	NULL	NULL	NULL	NULL	4	Using where
1	SIMPLE	t2	ALL	NULL	NULL	NULL	NULL	4	Using where
SELECT t1.i,t2.i FROM t1 ignore index (ixi),t2 IGNORE INDEX (ixi) WHERE t1.i<125 AND t2.i=t1.i LOCK IN SHARE MODE;
i	i
123	123
124	124
connection root1;
UPDATE t1,t2 SET t1.i=225,t2.i=225 WHERE t1.i=125 AND t2.i=t1.i;