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SET GLOBAL innodb_lock_wait_timeout=600;
DESCRIBE INFORMATION_SCHEMA.INNODB_TRX;
Field Type Null Key Default Extra
trx_id bigint unsigned NO
trx_state varchar(13) NO
trx_started datetime NO
trx_requested_lock_id varchar(126) YES
trx_wait_started datetime YES
trx_weight bigint unsigned NO
trx_mysql_thread_id bigint unsigned NO
trx_query varchar(1024) YES
trx_operation_state varchar(64) YES
trx_tables_in_use bigint unsigned NO
trx_tables_locked bigint unsigned NO
trx_lock_structs bigint unsigned NO
trx_lock_memory_bytes bigint unsigned NO
trx_rows_locked bigint unsigned NO
trx_rows_modified bigint unsigned NO
trx_concurrency_tickets bigint unsigned NO
trx_isolation_level varchar(16) NO
trx_unique_checks int NO
trx_foreign_key_checks int NO
trx_last_foreign_key_error varchar(256) YES
trx_adaptive_hash_latched int NO
trx_adaptive_hash_timeout bigint unsigned NO
trx_is_read_only int NO
trx_autocommit_non_locking int NO
trx_schedule_weight bigint unsigned YES
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),
CONSTRAINT fk1 FOREIGN KEY (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 5 0 1 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 `fk1` 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 `fk1` FOREIGN KEY (`c02`) REFERENCES `t1` (`c01`)
CREATE TABLE t0 (
id INT PRIMARY KEY,
trx_mysql_thread_id BIGINT
) ENGINE=InnoDB;
INSERT INTO t0 VALUES (1, CONNECTION_ID());
BEGIN;
SELECT * FROM t1 FOR SHARE;
c01 c02
1 2
2 4
3 6
4 8
INSERT INTO t0 VALUES (2, CONNECTION_ID());
BEGIN;
SELECT * FROM t1 FOR UPDATE;
INSERT INTO t0 VALUES (3, CONNECTION_ID());
BEGIN;
SELECT * FROM t1 FOR SHARE;
SELECT t0.id, trx_schedule_weight
FROM INFORMATION_SCHEMA.INNODB_TRX
JOIN t0 USING(trx_mysql_thread_id)
ORDER BY t0.id;
id trx_schedule_weight
1 NULL
2 2
3 1
ROLLBACK;
c01 c02
1 2
2 4
3 6
4 8
ROLLBACK;
c01 c02
1 2
2 4
3 6
4 8
ROLLBACK;
DROP TABLE t2;
DROP TABLE t1;
DROP TABLE t0;
SET GLOBAL innodb_lock_wait_timeout=default;
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