Re: Massive performance differences

From: Ragnar Hafstað <gnari(at)simnet(dot)is>
To: Andreas Hartmann <andreas(at)apache(dot)org>
Cc: pgsql-general(at)postgresql(dot)org
Subject: Re: Massive performance differences
Date: 2005-03-15 18:18:50
Message-ID: 1110910730.26976.60.camel@localhost.localdomain
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On Tue, 2005-03-15 at 18:10 +0100, Andreas Hartmann wrote:

> explain analyze select * from veranstaltung_original order by semester;
>
> Sort (cost=3054.08..3067.74 rows=5467 width=223) (actual
> time=2568.10..2573.02 rows=5467 loops=1)
> Sort Key: semester
> -> Seq Scan on veranstaltung_original (cost=0.00..2714.67 rows=5467
> width=223) (actual time=1936.68..2506.83 rows=5467 loops=1)
^^^^^^^
isn't this value (1936.68) suspiscious for a seq scan ?
can a lot of dead tuples cause this?
maybe VACUUM FULL ANALYSE time ?

gnari

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