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Re: Very long deletion time on a 200 GB database

From: Shaun Thomas <sthomas(at)peak6(dot)com>
To: "Reuven M(dot) Lerner" <reuven(at)lerner(dot)co(dot)il>
Cc: Glyn Astill <glynastill(at)yahoo(dot)co(dot)uk>, "pgsql-performance(at)postgresql(dot)org"<pgsql-performance(at)postgresql(dot)org>
Subject: Re: Very long deletion time on a 200 GB database
Date: 2012-02-24 14:34:06
Message-ID: 4F479FDE.1070509@peak6.com (view raw or flat)
Thread:
Lists: pgsql-performance
On 02/24/2012 12:39 AM, Reuven M. Lerner wrote:

> - CPU is virtually idle when running the deletes, using about 1% of
> CPU

I think you found your problem.

See if you can get the Windows admins to give you some info on how busy 
the disks are (percent utilization, IOPS, something) the next time you 
try this. Increasing your memory settings may help, but a 1% CPU usage 
usually suggests it's waiting for disk blocks to be read before it can 
actually do something.

-- 
Shaun Thomas
OptionsHouse | 141 W. Jackson Blvd. | Suite 500 | Chicago IL, 60604
312-444-8534
sthomas(at)peak6(dot)com

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Subject: Re: Very long deletion time on a 200 GB database
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