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Re: Suggestions on an update query

From: "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com>
To: Gregory Stark <stark(at)enterprisedb(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 02:31:11
Message-ID: 20071026193111.7a595247@scratch (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
On Sat, 27 Oct 2007 03:04:47 +0100
Gregory Stark <stark(at)enterprisedb(dot)com> wrote:

> > 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

It was hardly berating Greg, I even said please.

> 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.


Joshua D. Drake


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Subject: Re: partitioned table and ORDER BY indexed_field DESC LIMIT 1
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