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CREATE TABLE t1 (c1 INT NOT NULL PRIMARY KEY) ENGINE=InnoDB; INSERT INTO t1 VALUES (0); INSERT INTO t1 VALUES (10); # On connection 1 include/start_transaction_high_prio.inc START TRANSACTION /* HIGH PRIORITY */; UPDATE t1 SET c1=1 WHERE c1=0; # On connection 2 include/start_transaction_high_prio.inc START TRANSACTION /* HIGH PRIORITY */; UPDATE t1 SET c1=12 WHERE c1=10; # On connection 1 # Send UPDATE t1 SET c1=11 WHERE c1=10;; # On connection 2 UPDATE t1 SET c1=2 WHERE c1=0; ERROR 40001: Deadlock found when trying to get lock; try restarting transaction # On connection 1 # Reap UPDATE t1 SET c1=11 WHERE c1=10 COMMIT; include/assert.inc ['There is a 1 in t1'] include/assert.inc ['There is no 2 in t1'] include/assert.inc ['There is no 0 in t1'] DROP TABLE t1;