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A user can create a "lock" which is scoped to their user space. Multiple
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session of the user can see the lock.
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Please note, get_lock() was designed to be compatible with MySQL. If you
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hold any locks when calling get_lock() they will be released. For this
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reason you may want to consider calling get_locks() instead.
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Information on all barriers can be found in the DATA_DICTIONARY.USER_LOCKS