AccessExclusiveLock on tuple?

From: Christophe Pettus <xof(at)thebuild(dot)com>
To: pgsql-general list <pgsql-general(at)postgresql(dot)org>
Subject: AccessExclusiveLock on tuple?
Date: 2015-12-02 17:01:37
Message-ID: 2FC07A26-BEEB-4E49-B75B-2D5F1FC1DE81@thebuild.com
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On 9.4, I've encountered a locking message I've not seen before:

process 5293 still waiting for AccessExclusiveLock on tuple (88636,15) of relation 18238 of database 16415 after 5000.045 ms

What conditions produce an "AccessExclusiveLock on tuple"? Attempting to lock a tuple when another process has done an explicit LOCK ACCESS EXCLUSIVE?
--
-- Christophe Pettus
xof(at)thebuild(dot)com

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