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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Armand du Plessis <adp@bank.io>
Cc: pgsql-admin@postgresql.org <pgsql-admin@postgresql.org>
Subject: Re: Transaction ID wrap limit is log entries
Date: Mon, 20 May 2013 09:11:43 -0400
Message-ID: <3238.1369055503@sss.pgh.pa.us> (raw)
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Armand du Plessis <adp@bank.io> writes:
> The autovacuum completed (after many hours) however it didn't seem to have
> frozen any old pages as it just kicks off again right away with the same
> reason (VACUUM ANALYZE public.messages (to prevent wraparound))

I suspect it's unable to move the table's min XID forward at all because
there is some old open transaction preventing cleanup of very old dead
tuples.  Look for old xact_start times in pg_stat_activity.  Also look
for old entries in pg_prepared_xacts.  If you find any, get rid of them.

			regards, tom lane


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