IS_USED_LOCK
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Syntax
IS_USED_LOCK(str)
Description
Checks 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.
If 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).
See also
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