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Re: 7.4 Checkpoint Question

From: Andrew Sullivan <ajs(at)crankycanuck(dot)ca>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: 7.4 Checkpoint Question
Date: 2007-11-29 16:02:19
Message-ID: 20071129160219.GJ6226@crankycanuck.ca (view raw or flat)
Thread:
Lists: pgsql-performance
On Thu, Nov 29, 2007 at 10:10:54AM -0500, Brad Nicholson wrote:
> This is a _really _low volume system, less than 500 writes/hour.  Normal
> operation sees checkpoint related spikes of around 200-300 milliseconds.
> We always checkpoint at the checkpoint timeout (every 5 minutes).
> During this one checkpoint, I'm seeing transactions running 2-3 seconds.
> During this time, writes are < 5/minute.

> What gives?

pg_dump?  Remember that it has special locks approximately equivalent
(actually eq?  I forget) with SERIALIZABLE mode, which makes things rather
different.

A

-- 
Andrew Sullivan
Old sigs will return after re-constitution of blue smoke

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