From: | Rafael Martinez <r(dot)m(dot)guerrero(at)usit(dot)uio(dot)no> |
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To: | Heikki Linnakangas <heikki(at)enterprisedb(dot)com> |
Cc: | pgsql-performance(at)postgresql(dot)org |
Subject: | Re: Need to run CLUSTER to keep performance |
Date: | 2007-11-08 15:15:45 |
Message-ID: | 47332821.3010505@usit.uio.no |
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Lists: | pgsql-performance |
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(dot)m(dot)guerrero(at)usit(dot)uio(dot)no>
Center for Information Technology Services
University of Oslo, Norway
PGP Public Key: http://folk.uio.no/rafael/
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