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CREATE TABLE t1(a INT PRIMARY KEY, b VARCHAR(40), c INT, INDEX(b,c))
ENGINE=InnoDB;
INSERT INTO t1 VALUES (1,'1',1),(2,'2',1);
SET @save_locks= @@GLOBAL.innodb_status_output_locks;
SET GLOBAL INNODB_STATUS_OUTPUT_LOCKS = 'ON';
SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
BEGIN;
DELETE FROM t1 WHERE b='2' AND c=2;
SHOW ENGINE INNODB STATUS;
Type Name Status
InnoDB 2 lock struct(s), 1 row lock(s)
ROLLBACK;
SET TRANSACTION ISOLATION LEVEL REPEATABLE READ;
BEGIN;
DELETE FROM t1 WHERE b='2' AND c=2;
SHOW ENGINE INNODB STATUS;
Type Name Status
InnoDB 2 lock struct(s), 1 row lock(s)
ROLLBACK;
SET TRANSACTION ISOLATION LEVEL READ COMMITTED;
BEGIN;
DELETE FROM t1 WHERE b='2' AND c=2;
SHOW ENGINE INNODB STATUS;
Type Name Status
InnoDB 1 lock struct(s), 0 row lock(s)
ROLLBACK;
SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED;
BEGIN;
DELETE FROM t1 WHERE b='2' AND c=2;
SHOW ENGINE INNODB STATUS;
Type Name Status
InnoDB 1 lock struct(s), 0 row lock(s)
ROLLBACK;
SET GLOBAL INNODB_STATUS_OUTPUT_LOCKS = @save_locks;
DROP TABLE t1;
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