From: Alvaro Herrera <alvherre@commandprompt.com>
To: Ian Westmacott <ianw@intellivid.com>
Cc: pgsql-admin@postgresql.org
Subject: Re: 8.1.8 autovacuum missing databases
Date: Wed, 30 Apr 2008 12:19:42 -0400
Message-ID: <20080430161942.GC21286@alvh.no-ip.org> (raw)
In-Reply-To: <1209560546.5209.12.camel@vega.intellivid.com>
References: <1209499373.18622.47.camel@vega.intellivid.com>
<20080429203335.GK5652@alvh.no-ip.org>
<1209503103.18622.68.camel@vega.intellivid.com>
<20080429211244.GM5652@alvh.no-ip.org>
<1209560546.5209.12.camel@vega.intellivid.com>
Ian Westmacott wrote:
> On Tue, 2008-04-29 at 17:12 -0400, Alvaro Herrera wrote:
> > Can you verify whether age(pg_database.datfrozenxid) is shrinking after
> > vacuuming? If the age() of a database is higher than the applicable
> > max_freeze_age, then it will always be chosen.
>
> One of the databases is about 1.5TB, so that could take a while.
> Anything else I could look at in the meantime? The age of these
> databases right now is about 290039577. Also, autovacuum doesn't always
> choose the same DB, it alternates between template1 and one of mine --
> going back through a couple of months of logs I don't see it ever
> choosing the same one twice in a row.
Right -- if you have two databases over the wraparound edge, it will
alternate between them.
I still think that the autovac is dying before completing the task. Did
you investigate whether there are "ERROR" messages coming from
autovacuum? No PG crashes would happen.
--
Alvaro Herrera http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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To: pgsql-admin@postgresql.org
Cc: alvherre@commandprompt.com, ianw@intellivid.com
Subject: Re: 8.1.8 autovacuum missing databases
In-Reply-To: <20080430161942.GC21286@alvh.no-ip.org>
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