Syntax\n------\n\nIS_USED_LOCK(str)\n\nDescription\n-----------\n\nChecks whether the lock named str is in use (that is, locked). If so, it returns the connection identifier of the client that holds the lock. Otherwise, it returns NULL. str is case insensitive.\n\nIf the metadata_lock_info plugin is installed, the Information Schema metadata_lock_info table contains information about locks of this kind (as well as metadata locks).\n\nStatements using the IS_USED_LOCK function are not safe for statement-based replication.\n\nURL: https://mariadb.com/docs/server/reference/sql-functions/secondary-functions/miscellaneous-functions/is_used_lock