From: Jonathan Sinclair <jonathan.sinclair@molevalleyfarmers.com>
To: pgsql-sql@postgresql.org
Subject: Query response time
Date: Tue, 8 Aug 2006 13:25:47 +0100
Message-ID: <746457F7E51F3B4BB53A8447D7204B78E456@MVGMAIL.mvg.local> (raw)
Hi all,
I am using PostgresSQL 7.4 and having some serious performance issues.
Trawling through the archives and previous posts the only visible advice
I could see was either by running vacuum or setting the fsynch flag to
false.
I am using tables that only contain approx 2GB of data. However
performing a number of simple conditional select statements takes a
great deal of time. Putting limits on the data obviously reduces the
time, but there is still a delay. (Note: on one particular query I set
the limit to 538 and the query returns in under 2mins if the limit
becomes 539 the query loops indefinitely!)
From previous experience I know these delays are longer than both
Informix and MySql. In some instances it takes so long I end up having
to kill the query.
The install was performed by yum onto a RAID server using Centos. I am
sure there is something fundamentally wrong for I can't believe that
postgres would have the reputation it has based on the statistics I'm
getting. Does anyone have any advice?
The data I am using was imported from an Informix system as part of a
migration strategy.
I know this is long shot but I hope someone can shed some light.
Regards,
Jonathan
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To: pgsql-sql@postgresql.org
Cc: jonathan.sinclair@molevalleyfarmers.com
Subject: Re: Query response time
In-Reply-To: <746457F7E51F3B4BB53A8447D7204B78E456@MVGMAIL.mvg.local>
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