Syntax
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Description
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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.

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