Re: performance drop on 8.2.4, reverting to 8.1.4

From: "Steinar H(dot) Gunderson" <sgunderson(at)bigfoot(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: performance drop on 8.2.4, reverting to 8.1.4
Date: 2007-05-18 13:10:47
Message-ID: 20070518131047.GA14326@uio.no
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-performance

On Fri, May 18, 2007 at 02:51:42PM +0300, Liviu Ionescu wrote:
> it helped, the new version of the query takes 2303 ms on both 8.1.4 and 8.2.4.

And the old one?

> any idea why the 8.2.4 planner is not happy with the initial select? was it
> just a big chance that it worked in 8.1.4 or the 8.2.4 planner has a
> problem?

I guess it was more or less by chance, especially as 8.1 did not reorder
outer joins. Others might know more about the estimation, though.

/* Steinar */
--
Homepage: http://www.sesse.net/

In response to

Responses

Browse pgsql-performance by date

  From Date Subject
Next Message Liviu Ionescu 2007-05-18 13:33:37 Re: performance drop on 8.2.4, reverting to 8.1.4
Previous Message Liviu Ionescu 2007-05-18 11:51:42 Re: performance drop on 8.2.4, reverting to 8.1.4