MariaDB starting with 10.3.0

MariaDB 10.3.0开始,引入扩展语法以便下面的语句可以使用innodb_lock_wait_timeout变量和lock_wait_timeout变量设置的锁等待时长:

语法

ALTER TABLE tbl_name [WAIT n|NOWAIT] ...
CREATE ... INDEX ON tbl_name (index_col_name, ...) [WAIT n|NOWAIT] ...
DROP INDEX ... [WAIT n|NOWAIT]
DROP TABLE tbl_name [WAIT n|NOWAIT] ...
LOCK TABLE ... [WAIT n|NOWAIT]
OPTIMIZE TABLE tbl_name [WAIT n|NOWAIT]
RENAME TABLE tbl_name [WAIT n|NOWAIT] ...
SELECT ... FOR UPDATE [WAIT n|NOWAIT]
SELECT ... LOCK IN SHARE MODE [WAIT n|NOWAIT]
TRUNCATE TABLE tbl_name [WAIT n|NOWAIT]

描述

锁等待超时时长可以通过WAIT n(单位为秒)来精确设置,或者设置为NOWAIT,这种情况下,如果无法获取锁会立即返回失败。WAIT 0等价于NOWAIT

See also

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