From: Heiko W.Rupp <heiko.rupp@redhat.com>
To: pgsql-performance@postgresql.org
Subject: Re: slow result
Date: Tue, 23 Jan 2007 11:43:16 +0100
Message-ID: <08E18820-41DF-4170-A39E-B5DFAAF1C690@redhat.com> (raw)
In-Reply-To: <5.0.2.1.2.20070123113422.00d189e8@pop.univ-montp2.fr>
References: <5.0.2.1.2.20070123113422.00d189e8@pop.univ-montp2.fr>
Am 23.01.2007 um 11:34 schrieb Laurent Manchon:
> Hi,
>
> I have a slow response of my PostgreSQL database 7.4 using this
> query below
> on a table with 800000 rows:
>
> select count(*)from tbl;
count(*) is doing a full tablescan over all your 800000 rows. This is
a well known "feature"
of postgres :-/
So enhancing the performance is currently only possible by having
faster disk drives.
--
Heiko W.Rupp
heiko.rupp@redhat.com, http://www.dpunkt.de/buch/
3-89864-429-4.html
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To: pgsql-performance@postgresql.org
Cc: heiko.rupp@redhat.com
Subject: Re: slow result
In-Reply-To: <08E18820-41DF-4170-A39E-B5DFAAF1C690@redhat.com>
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