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DROP TABLE IF EXISTS t1; SET @low_prio_updates = @@global.low_priority_updates; SET @concur_insert = @@global.concurrent_insert; SET GLOBAL concurrent_insert = NEVER; connect con0,localhost,root,,; SET lock_wait_timeout = 4; connect con1,localhost,root,,; SET lock_wait_timeout = 4; connect con2,localhost,root,,; SET lock_wait_timeout = 4; CREATE TABLE t1 (a <INT_COLUMN>, b <CHAR_COLUMN>) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>; INSERT INTO t1 (a,b) VALUES (1,'f'),(2,'b'); SET GLOBAL LOW_PRIORITY_UPDATES = 1; connection con1; SELECT SLEEP(1) FROM t1; connection con0; INSERT INTO t1 (a,b) VALUES (3,'z'); connection con2; # Should return only 2 rows SELECT SLEEP(1) FROM t1; SLEEP(1) 0 0 connection con1; SLEEP(1) 0 0 connection con0; SELECT a,b FROM t1; a b 1 f 2 b 3 z DROP TABLE t1; CREATE TABLE t1 (a <INT_COLUMN>, b <CHAR_COLUMN>) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>; INSERT INTO t1 (a,b) VALUES (1,'f'),(2,'b'); connection con1; SELECT SLEEP(1) FROM t1; connection con0; INSERT HIGH_PRIORITY INTO t1 (a,b) VALUES (3,'z'); connection con2; # Should return 3 rows SELECT SLEEP(1) FROM t1; SLEEP(1) 0 0 0 connection con1; SLEEP(1) 0 0 connection con0; SELECT a,b FROM t1; a b 1 f 2 b 3 z disconnect con1; disconnect con2; disconnect con0; connection default; SET GLOBAL low_priority_updates = @low_prio_updates; SET GLOBAL concurrent_insert = @concur_insert; DROP TABLE t1;