Re: Power cut and performance problem

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Regards,

-----Original Message-----
From: pgsql-sql-owner(at)postgresql(dot)org
[mailto:pgsql-sql-owner(at)postgresql(dot)org]On Behalf Of Jeff Frost
Sent: Tuesday, March 21, 2006 9:19 PM
To: Daniel Caune
Cc: pgsql-sql(at)postgresql(dot)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(at)frostconsultingllc(dot)com>
Frost Consulting, LLC http://www.frostconsultingllc.com/
Phone: 650-780-7908 FAX: 650-649-1954

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