From: Jim C. Nasby <jnasby@pervasive.com>
To: jody brownell <jody.brownell@q1labs.com>
Cc: Csaba Nagy <nagy@ecircle-ag.com>
Cc: postgres performance list <pgsql-performance@postgresql.org>
Subject: Re: Help tuning autovacuum - seeing lots of relationbloat
Date: Wed, 21 Jun 2006 14:38:24 -0500
Message-ID: <20060621193823.GI93655@pervasive.com> (raw)
In-Reply-To: <200606211321.06253.jody.brownell@q1labs.com>
References: <200606211052.43227.jody.brownell@q1labs.com>
<200606211227.06618.jody.brownell@q1labs.com>
<1150904541.3309.38.camel@coppola.muc.ecircle.de>
<200606211321.06253.jody.brownell@q1labs.com>
On Wed, Jun 21, 2006 at 01:21:05PM -0300, jody brownell wrote:
> Jun 21 13:04:04 vanquish postgres[3311]: [19-1] DEBUG: "target": removed 5645231 row versions in 106508 pages
> Jun 21 13:04:04 vanquish postgres[3311]: [19-2] DETAIL: CPU 3.37s/1.23u sec elapsed 40.63 sec.
> Jun 21 13:04:04 vanquish postgres[3311]: [20-1] DEBUG: "target": found 5645231 removable, 1296817 nonremovable row versions in 114701 pages
> Jun 21 13:04:04 vanquish postgres[3311]: [20-2] DETAIL: 0 dead row versions cannot be removed yet.
So the table contained 5.6M dead rows and 1.3M live rows.
I think you should forget about having autovacuum keep this table
in-check and add manual vacuum commands to your code. Autovac is
intended to deal with 99% of use cases; this is pretty clearly in the 1%
it can't handle.
--
Jim C. Nasby, Sr. Engineering Consultant jnasby@pervasive.com
Pervasive Software http://pervasive.com work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-performance@postgresql.org
Cc: jnasby@pervasive.com, jody.brownell@q1labs.com, nagy@ecircle-ag.com
Subject: Re: Help tuning autovacuum - seeing lots of relationbloat
In-Reply-To: <20060621193823.GI93655@pervasive.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox