Re: Need to run CLUSTER to keep performance - Mailing list pgsql-performance

From Rafael Martinez
Subject Re: Need to run CLUSTER to keep performance
Date
Msg-id 47332821.3010505@usit.uio.no
Whole thread Raw
In response to Re: Need to run CLUSTER to keep performance  (Heikki Linnakangas <heikki@enterprisedb.com>)
List 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.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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