Re: Overriding the optimizer - Mailing list pgsql-performance

From Craig A. James
Subject Re: Overriding the optimizer
Date
Msg-id 43A236BC.1070300@modgraph-usa.com
Whole thread Raw
In response to Re: Overriding the optimizer  (Christopher Kings-Lynne <chriskl@familyhealth.com.au>)
List pgsql-performance
Christopher Kings-Lynne wrote:
> So your main example bad query is possibly just a case of lack of
> analyze stats and wrong postgresql.conf config?  And that's what causes
> you to shut down your database?  Don't you want your problem FIXED?

I'm trying to help by raising a question that I think is important, and have an honest, perhaps vigorous, but
respectful,discussion about it.  I respect everyone's opinion, and I hope you respect mine.  I've been in this business
along time, and I don't raise issues lightly. 

Yes, I want my query fixed.  And I may post it, in a thread with a new title.  In fact, I posted a different query with
essentiallythe same problem a while back and got nothing that helped: 

    http://archives.postgresql.org/pgsql-performance/2005-11/msg00133.php

(I can't help but point out that Tom's response was to suggest a way to fool the optimizer so as to prevent it from
"optimizing"the query.  In other words, he told me a trick that would force a particular plan on the optimizer.  Which
isexactly the point of this discussion.) 

The point is that the particular query is not relevant -- it's the fact that this topic (according to Tom) has been and
continuesto be raised.  This should tell us all something, that it's not going to go away, and that it's a real issue. 

Regards,
Craig

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