From: Tom Lane <tgl@sss.pgh.pa.us>
To: Gavin Hamill <gdh@laterooms.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: pg 8.1.3, AIX, huge box, painfully slow.
Date: Fri, 07 Apr 2006 14:41:39 -0400
Message-ID: <15233.1144435299@sss.pgh.pa.us> (raw)
In-Reply-To: <20060407185823.abe93017.gdh@laterooms.com>
References: <20060407185823.abe93017.gdh@laterooms.com>
Gavin Hamill <gdh@laterooms.com> writes:
> OK, having moved from our quad-xeon to an 8-CPU IBM pSeries 650
> (8x1.45GHz POWER4 instead of 4 x 3GHz Xeon), our query times have shot
> up and our website is next to unusable. The IBM is not swapping (not
> with 16GB of RAM!), disk i/o is low, but there must be something
> critically wrong for this monster to be performing so badly..
Have you vacuumed/analyzed since reloading your data? Compare some
EXPLAIN ANALYZE outputs for identical queries on the two machines,
that usually helps figure out what's wrong.
regards, tom lane
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To: pgsql-performance@postgresql.org
Cc: tgl@sss.pgh.pa.us, gdh@laterooms.com
Subject: Re: pg 8.1.3, AIX, huge box, painfully slow.
In-Reply-To: <15233.1144435299@sss.pgh.pa.us>
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