Skip site navigation (1) Skip section navigation (2)

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 or flat)
Thread:
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.
> 

Sincerely,

Joshua D. Drake


-- 

      === The PostgreSQL Company: Command Prompt, Inc. ===
Sales/Support: +1.503.667.4564   24x7/Emergency: +1.800.492.2240
PostgreSQL solutions since 1997  http://www.commandprompt.com/
			UNIQUE NOT NULL
Donate to the PostgreSQL Project: http://www.postgresql.org/about/donate
PostgreSQL Replication: http://www.commandprompt.com/products/

In response to

pgsql-performance by date

Next:From: AntonDate: 2007-10-27 04:26:21
Subject: Re: partitioned table and ORDER BY indexed_field DESC LIMIT 1
Previous:From: Gregory StarkDate: 2007-10-27 02:04:47
Subject: Re: Suggestions on an update query

Privacy Policy | About PostgreSQL
Copyright © 1996-2014 The PostgreSQL Global Development Group