From: Tom Lane <tgl@sss.pgh.pa.us>
To: Alvaro Herrera <alvherre@alvh.no-ip.org>
Cc: Chris Browne <cbbrowne@acm.org>
Cc: pgsql-admin@postgresql.org
Cc: pgsql-hackers@postgresql.org
Subject: Re: [HACKERS] autovacuum
Date: Wed, 01 Feb 2006 13:18:31 -0500
Message-ID: <3155.1138817911@sss.pgh.pa.us> (raw)
In-Reply-To: <20060201172905.GA7879@surnet.cl>
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<5001.71.40.140.99.1138286468.squirrel@mail.tocr.com>
<60psm7knlq.fsf@dba2.int.libertyrms.com>
<20060201172905.GA7879@surnet.cl>
Alvaro Herrera <alvherre@alvh.no-ip.org> writes:
> Hmm, yeah, sounds useful. There's one implementation issue to notice
> however, and it's that the autovacuum process dies and restarts for each
> iteration, so there's no way for it to remember previous state unless
> it's saved somewhere permanent, as the stats info is.
I think you'd really need to remember the previous oldest XID on a
per-table basis to get full traction out of the idea. But weren't we
thinking of tracking something isomorphic to this for purposes of
minimizing anti-wraparound VACUUMs?
regards, tom lane
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To: pgsql-admin@postgresql.org
Cc: tgl@sss.pgh.pa.us, alvherre@alvh.no-ip.org, cbbrowne@acm.org, pgsql-hackers@postgresql.org
Subject: Re: [HACKERS] autovacuum
In-Reply-To: <3155.1138817911@sss.pgh.pa.us>
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