From: Aftab Alam <aalam@tatashare.com>
To: 'Jeff Frost' <jeff@frostconsultingllc.com>
To: 'Daniel Caune' <daniel.caune@ubisoft.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: Power cut and performance problem
Date: Wed, 22 Mar 2006 09:08:47 +0530
Message-ID: <003601c64d62$20db1400$ec1010ac@aftabn463> (raw)
In-Reply-To: <Pine.LNX.4.64.0603210747020.969@discord.dyndns.org>
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Regards,
-----Original Message-----
From: pgsql-sql-owner@postgresql.org
[mailto:pgsql-sql-owner@postgresql.org]On Behalf Of Jeff Frost
Sent: Tuesday, March 21, 2006 9:19 PM
To: Daniel Caune
Cc: pgsql-sql@postgresql.org
Subject: Re: [SQL] Power cut and performance problem
On Tue, 21 Mar 2006, Daniel Caune wrote:
> For example, the execution of the following query is fast as it used to
> be (gslog_event_id is the primary key on gslog_event):
>
> select max(gslog_event_id) from gslog_event; (=> Time: 0.773 ms)
>
>
> while the following query is really slow (several minutes):
>
> select min(gslog_event_id) from gslog_event; (index on the primary key
> is taken)
>
>
> I'm not a hardware expert at all, but I supposed that the whole
> performance would be degraded when a problem occurs with RAID disks. Am
> I wrong? Could it be something else? Are there some tools that check
> the state of a PostgreSQL database?
You would be correct, a hardware problem should manifest itself on both
those
queries. What is the explain analyze output of those two queries? It's
possible you have a corrupt index on gslog_event. If that's the case, a
reindex would likely remedy the problem. Is postgres logging any errors?
--
Jeff Frost, Owner <jeff@frostconsultingllc.com>
Frost Consulting, LLC http://www.frostconsultingllc.com/
Phone: 650-780-7908 FAX: 650-649-1954
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To: pgsql-sql@postgresql.org
Cc: aalam@tatashare.com, jeff@frostconsultingllc.com, daniel.caune@ubisoft.com
Subject: Re: Power cut and performance problem
In-Reply-To: <003601c64d62$20db1400$ec1010ac@aftabn463>
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