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CREATE TABLE t1 (c1 INT PRIMARY KEY)ENGINE=INNODB; CREATE TABLE t2 (c2 INT PRIMARY KEY, FOREIGN KEY (c2) REFERENCES t1(c1))ENGINE=INNODB; INSERT INTO t1 VALUES(1); # On Connection 1 START TRANSACTION; DELETE FROM t1 WHERE c1 = 1; # On Connection 2 include/start_transaction_high_prio.inc START TRANSACTION /* HIGH PRIORITY */; INSERT INTO t2 VALUES(1); COMMIT; # On connection 1 COMMIT; ERROR HY000: Got error 149 during COMMIT DROP TABLE t2, t1; CREATE TABLE t1 (c1 INT PRIMARY KEY)ENGINE=INNODB; CREATE TABLE t2 (c2 INT PRIMARY KEY, FOREIGN KEY (c2) REFERENCES t1(c1) ON UPDATE CASCADE)ENGINE=INNODB; INSERT INTO t1 VALUES(1); # On Connection 1 START TRANSACTION; UPDATE t1 SET C1=2 where C1 = 1; # On Connection 2 include/start_transaction_high_prio.inc START TRANSACTION /* HIGH PRIORITY */; INSERT INTO t2 VALUES (1); COMMIT; # On connection 1 COMMIT; ERROR HY000: Got error 149 during COMMIT DROP TABLE t2, t1;