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UNLOCK TABLES

Syntax

UNLOCK TABLES

Description

UNLOCK TABLES explicitly releases any table locks held by the current session. See LOCK TABLES for more information.

In addition to releasing table locks acquired by the LOCK TABLES statement, the UNLOCK TABLES statement also releases the global read lock acquired by the FLUSH TABLES WITH READ LOCK statement. The FLUSH TABLES WITH READ LOCK statement is very useful for performing backups. See FLUSH for more information about FLUSH TABLES WITH READ LOCK.

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https://mariadb.com/kb/en/transactions-unlock-tables/