From: | Rafael Martinez <r(dot)m(dot)guerrero(at)usit(dot)uio(dot)no> |
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To: | Rafael Martinez <r(dot)m(dot)guerrero(at)usit(dot)uio(dot)no>, pgsql-performance(at)postgresql(dot)org |
Subject: | Re: Need to run CLUSTER to keep performance |
Date: | 2007-11-08 15:10:10 |
Message-ID: | 473326D2.6030600@usit.uio.no |
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Lists: | pgsql-performance |
Alvaro Herrera wrote:
> Rafael Martinez wrote:
>> The 'problem' is that performance decrease during the day and the only
>> thing that helps is to run CLUSTER on the table with problems. VACUUM
>> ANALYZE does not help.
>
> Probably because all the live tuples are clustered at the end of the
> table, and the initial pages are polluted with dead tuples. Try
> vacuuming the table much more often, say every few minutes.
>
> Your table is 2536 pages long, but it could probably be in the vicinity
> of 700 ...
>
We run VACUUM ANALYZE every 10 minuttes during 2-3 days to see if it
helped, but when it didn't we when back to the old configuration (1 time
everyday)
Yes, after a CLUSTER we are using 517 pages. But the table does not grow
much, it is always around 12-20MB, it looks like vacuum works without
problems.
regards,
--
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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