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DROP TABLE IF EXISTS t1; CREATE TABLE t1 (a <INT_COLUMN>, b <CHAR_COLUMN>) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS>; INSERT INTO t1 (a,b) VALUES (11,'foobar'),(12,'b'); SET LOW_PRIORITY_UPDATES = 0; SET lock_wait_timeout = 4; connect con1,localhost,root,,; SET lock_wait_timeout = 2; SELECT a+SLEEP(1) FROM t1; connection default; UPDATE t1 SET a=a+10; connect con2,localhost,root,,; SET lock_wait_timeout = 3; SELECT a+SLEEP(1) FROM t1; a+SLEEP(1) 21 22 connection con1; a+SLEEP(1) 11 12 connection default; SELECT a,b FROM t1; a b 21 foobar 22 b connection con1; SELECT a+SLEEP(1) FROM t1; connection default; UPDATE LOW_PRIORITY t1 SET a=a+20; connection con2; SELECT a+SLEEP(1) FROM t1; a+SLEEP(1) 21 22 connection con1; a+SLEEP(1) 21 22 connection default; SELECT a,b FROM t1; a b 41 foobar 42 b SET LOW_PRIORITY_UPDATES = 1; connection con1; SELECT a+SLEEP(1) FROM t1; connection default; UPDATE t1 SET a=a+30; connection con2; SELECT a+SLEEP(1) FROM t1; a+SLEEP(1) 41 42 connection con1; a+SLEEP(1) 41 42 connection default; SELECT a,b FROM t1; a b 71 foobar 72 b disconnect con1; disconnect con2; connection default; DROP TABLE t1;