SET GLOBAL innodb_lock_wait_timeout=600;
DESCRIBE INFORMATION_SCHEMA.INNODB_TRX;
Field	Type	Null	Key	Default	Extra
trx_id	varchar(18)	NO			
trx_state	varchar(13)	NO			
trx_started	datetime	NO		0000-00-00 00:00:00	
trx_requested_lock_id	varchar(81)	YES		NULL	
trx_wait_started	datetime	YES		NULL	
trx_weight	bigint(21) unsigned	NO		0	
trx_mysql_thread_id	bigint(21) unsigned	NO		0	
trx_query	varchar(1024)	YES		NULL	
trx_operation_state	varchar(64)	YES		NULL	
trx_tables_in_use	bigint(21) unsigned	NO		0	
trx_tables_locked	bigint(21) unsigned	NO		0	
trx_lock_structs	bigint(21) unsigned	NO		0	
trx_lock_memory_bytes	bigint(21) unsigned	NO		0	
trx_rows_locked	bigint(21) unsigned	NO		0	
trx_rows_modified	bigint(21) unsigned	NO		0	
trx_concurrency_tickets	bigint(21) unsigned	NO		0	
trx_isolation_level	varchar(16)	NO			
trx_unique_checks	int(1)	NO		0	
trx_foreign_key_checks	int(1)	NO		0	
trx_last_foreign_key_error	varchar(256)	YES		NULL	
trx_adaptive_hash_latched	int(1)	NO		0	
trx_adaptive_hash_timeout	bigint(21) unsigned	NO		0	
trx_is_read_only	int(1)	NO		0	
trx_autocommit_non_locking	int(1)	NO		0	
DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (
c01 INT,
c02 INT,
PRIMARY KEY (c01)
) ENGINE=INNODB STATS_AUTO_RECALC=0;
INSERT INTO t1 VALUES
(1,2),(2,4),(3,6),(4,8);
CREATE TABLE t2 (
c01 INT,
c02 INT,
PRIMARY KEY (c01),
FOREIGN KEY fk1 (c02) REFERENCES t1 (c01)
) ENGINE=INNODB STATS_AUTO_RECALC=0;
INSERT INTO t2 VALUES
(1,1),(2,2),(3,3);
SET autocommit=0;
INSERT INTO t1 VALUES (5,10);
SELECT * FROM t1 FOR UPDATE;
c01	c02
1	2
2	4
3	6
4	8
5	10
SELECT trx_state, trx_weight, trx_tables_in_use, trx_tables_locked,
trx_rows_locked, trx_rows_modified, trx_concurrency_tickets,
trx_isolation_level, trx_unique_checks, trx_foreign_key_checks
FROM INFORMATION_SCHEMA.INNODB_TRX;
trx_state	trx_weight	trx_tables_in_use	trx_tables_locked	trx_rows_locked	trx_rows_modified	trx_concurrency_tickets	trx_isolation_level	trx_unique_checks	trx_foreign_key_checks
RUNNING	4	0	0	7	1	0	REPEATABLE READ	1	1
ROLLBACK;
SET FOREIGN_KEY_CHECKS = 0;
SET UNIQUE_CHECKS = 0;
SET TRANSACTION ISOLATION LEVEL SERIALIZABLE;
BEGIN;
INSERT INTO t1 VALUES (6,12);
SELECT trx_isolation_level, trx_unique_checks, trx_foreign_key_checks
FROM INFORMATION_SCHEMA.INNODB_TRX;
trx_isolation_level	trx_unique_checks	trx_foreign_key_checks
SERIALIZABLE	0	0
ROLLBACK;
SET FOREIGN_KEY_CHECKS = 1;
SET UNIQUE_CHECKS = 1;
BEGIN;
INSERT INTO t2 VALUES (4,10);
ERROR 23000: Cannot add or update a child row: a foreign key constraint fails (`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`c02`) REFERENCES `t1` (`c01`))
SELECT trx_state, trx_isolation_level, trx_last_foreign_key_error
FROM INFORMATION_SCHEMA.INNODB_TRX;
trx_state	trx_isolation_level	trx_last_foreign_key_error
RUNNING	REPEATABLE READ	`test`.`t2`, CONSTRAINT `t2_ibfk_1` FOREIGN KEY (`c02`) REFERENCES `t1` (`c01`)
DROP TABLE t2;
DROP TABLE t1;
SET GLOBAL innodb_lock_wait_timeout=default;
