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SET SESSION wsrep_sync_wait = 0;
SET SESSION lock_wait_timeout = 60;
SET SESSION innodb_lock_wait_timeout=60;
SET SESSION wait_timeout=60;
CREATE TABLE t1 (f1 INTEGER PRIMARY KEY) ENGINE=InnoDB;
FLUSH TABLE t1 WITH READ LOCK;
ALTER TABLE t1 ADD COLUMN f2 INTEGER;
SELECT 1 FROM DUAL;
1
1
SELECT COUNT(*) = 1 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user' AND STATE = 'Waiting for table metadata lock';
COUNT(*) = 1
1
UNLOCK TABLES;
SET SESSION wsrep_sync_wait = 15;
SHOW CREATE TABLE t1;
Table Create Table
t1 CREATE TABLE `t1` (
`f1` int(11) NOT NULL,
`f2` int(11) DEFAULT NULL,
PRIMARY KEY (`f1`)
) ENGINE=InnoDB DEFAULT CHARSET=latin1
SELECT COUNT(*) = 0 FROM INFORMATION_SCHEMA.PROCESSLIST WHERE USER = 'system user' AND STATE = 'Waiting for table metadata lock';
COUNT(*) = 0
1
DROP TABLE t1;
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