From: Rafael Martinez <r.m.guerrero@usit.uio.no>
To: Heikki Linnakangas <heikki@enterprisedb.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Need to run CLUSTER to keep performance
Date: Thu, 08 Nov 2007 16:15:45 +0100
Message-ID: <47332821.3010505@usit.uio.no> (raw)
In-Reply-To: <473326C3.3070206@enterprisedb.com>
References: <4732E6B4.1030907@usit.uio.no>
<4732EF07.3060807@enterprisedb.com>
<47332200.9050705@usit.uio.no>
<473326C3.3070206@enterprisedb.com>
Heikki Linnakangas wrote:
>
> If the table is already bloated, a VACUUM won't usually shrink it. It
> only makes the space available for reuse, but a sequential scan still
> needs to go through a lot of pages.
>
> CLUSTER on the other hand repacks the tuples and gets rid of all the
> unused space on pages. You need to run CLUSTER or VACUUM FULL once to
> shrink the relation, but after that frequent-enough VACUUMs should keep
> the table size down.
>
Ok, thanks for the advice. We will try this and will come back with more
information.
--
Rafael Martinez, <r.m.guerrero@usit.uio.no>
Center for Information Technology Services
University of Oslo, Norway
PGP Public Key: http://folk.uio.no/rafael/
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To: pgsql-performance@postgresql.org
Cc: r.m.guerrero@usit.uio.no, heikki@enterprisedb.com
Subject: Re: Need to run CLUSTER to keep performance
In-Reply-To: <47332821.3010505@usit.uio.no>
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