On Dec 2, 2015, at 9:25 AM, Bill Moran <wmoran@xxxxxxxxxxxxxxxxx> wrote: > No. See the section on row level locks here: > http://www.postgresql.org/docs/9.4/static/explicit-locking.html That wasn't quite my question. I'm familiar with the row-level locking and the locking messages in general, but this message implies there is such a thing as an AccessExclusiveLock on a tuple, which is new to me. I wasn't able to produce this message experimentally doing various combinations of UPDATE statements and SELECT FOR UPDATEs, or even with explicit LOCK ACCESS EXCLUSIVE MODE, thus the question. -- -- Christophe Pettus xof@xxxxxxxxxxxx -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general