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Re: Slow deletes in 8.1 when FKs are involved

From: "Jim C(dot) Nasby" <jnasby(at)pervasive(dot)com>
To: Will Reese <wreese(at)rackspace(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Slow deletes in 8.1 when FKs are involved
Date: 2006-04-24 17:09:15
Message-ID: 20060424170914.GE38186@pervasive.com (view raw or flat)
Thread:
Lists: pgsql-performance
On Sun, Apr 23, 2006 at 09:41:14PM -0500, Will Reese wrote:
> I'm preparing for an upgrade from PostgreSQL 7.4.5 to 8.1.3, and I  
> noticed a potential performance issue.
> 
> I have two servers, a dual proc Dell with raid 5 running PostgreSQL  
> 7.4, and a quad proc Dell with a storage array running PostgreSQL  
> 8.1. Both servers have identical postgresql.conf settings and were  

BTW, you'll want to tweak some things between the two .conf files,
especially if the 8.1.3 server has more memory. Faster drive array means
you probably want to tweak random_page_cost down.

Also, 8.1.3 has a lot of new config settings compared to 7.4.x; it'd
probably be best to take the default 8.1 config and tweak it, rather
than bringing the 7.4 config over.
-- 
Jim C. Nasby, Sr. Engineering Consultant      jnasby(at)pervasive(dot)com
Pervasive Software      http://pervasive.com    work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf       cell: 512-569-9461

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