SET @save_frequency=@@GLOBAL.innodb_purge_rseg_truncate_frequency;SET GLOBAL innodb_purge_rseg_truncate_frequency=1;CREATE TABLE t1(id INT PRIMARY key, val VARCHAR(16000)) ENGINE=InnoDB;INSERT INTO t1 (id,val) SELECT 2*seq,'x' FROM seq_0_to_1023;connect con1,localhost,root,,;
START TRANSACTION WITH CONSISTENT SNAPSHOT;connection default;DELETE FROM t1 WHERE id=1788;BEGIN;SELECT * FROM t1 WHERE id=1788 FOR UPDATE;id valconnection con1;COMMIT;InnoDB 0 transactions not purgedconnection default;INSERT INTO t1 (id,val) VALUES (1787, REPEAT('x',2000));connection con1;SET innodb_lock_wait_timeout=0;INSERT INTO t1 (id,val) VALUES (1788, 'x');ERROR HY000: Lock wait timeout exceeded; try restarting transactionSELECT * FROM t1 WHERE id=1788 FOR UPDATE;id valdisconnect con1;connection default;COMMIT;DROP TABLE t1;SET GLOBAL innodb_purge_rseg_truncate_frequency=@save_frequency;