Re: Perfomance difference between 7.2 and 7.3

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Paulo Jan <admin(at)digital(dot)ddnet(dot)es>
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: Perfomance difference between 7.2 and 7.3
Date: 2003-11-12 15:38:00
Message-ID: 8835.1068651480@sss.pgh.pa.us
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Paulo Jan <admin(at)digital(dot)ddnet(dot)es> writes:
> -> Seq Scan on todocinetv (cost=0.00..37768.90 rows=28792
> width=8)

The estimated cost seems to be more than one disk page read per row
returned. This suggests to me that you have a huge amount of dead space
in that table --- try a VACUUM FULL on it. If that fixes the problem,
then you need to improve your housekeeping procedures on the 7.2
installation: run vacuums more often and ensure that your FSM settings
are large enough.

regards, tom lane

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