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Re: Suggestions on an update query

From: Gregory Stark <stark(at)enterprisedb(dot)com>
To: "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>
Cc: "Campbell\, Lance" <lance(at)uiuc(dot)edu>, <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Suggestions on an update query
Date: 2007-10-27 02:04:47
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
"Joshua D. Drake" <jd(at)commandprompt(dot)com> writes:

> On Fri, 26 Oct 2007 15:31:44 -0500
> "Campbell, Lance" <lance(at)uiuc(dot)edu> wrote:
>> I forgot to include an additional parameter I am using in
>> Postgresql.conf: 
> O.k. first, just to get it out of the way (and then I will try and
> help). Please do not top post, it makes replying contextually very
> difficult.
>> PostgreSql version 8.2.4
>> Memory = 8 Gig
>> CPUs 1 dual core Zeon running at 3.0
> O.k. first you might be grinding through your 20 checkpoint segments
> but in reality what I think is happening is you are doing foreign key
> checks against all of it and slowing things down.

If you're going to berate someone about top-posting perhaps you should attach
your own commentary to relevant bits of context :P

But the original post didn't include any foreign key constraints. I suspect
you've guessed it right though. In fact I suspect what's happening is he
doesn't have an index on the referencing column so the foreign key checks are
doing sequential scans of.

  Gregory Stark

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Subject: Re: Suggestions on an update query
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