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Re: BUG #5165: Poor performance with Left-join where right side does not exist

From: assaf lehr <assaf_lehr(at)yahoo(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>, pgsql-bugs(at)postgresql(dot)org
Subject: Re: BUG #5165: Poor performance with Left-join where right side does not exist
Date: 2009-11-05 22:23:13
Message-ID: 228785.60021.qm@web53701.mail.re2.yahoo.com (view raw or flat)
Thread:
Lists: pgsql-bugs
ok. thanks, when my project will move to 8.4, I `ll re-do this test.




________________________________
From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>
Cc: Robert Haas <robertmhaas(at)gmail(dot)com>; assaf lehr <assaf_lehr(at)yahoo(dot)com>; pgsql-bugs(at)postgresql(dot)org
Sent: Thu, November 5, 2009 5:21:28 PM
Subject: Re: [BUGS] BUG #5165: Poor performance with Left-join where right side does not exist 

"Kevin Grittner" <Kevin(dot)Grittner(at)wicourts(dot)gov> writes:
> assaf lehr <assaf_lehr(at)yahoo(dot)com> wrote:
>> let me explain it better.
>> [hand-waving and pseudo-code]

> People would like to help you, but you're not providing enough
> information to let them.

Well, the really important point is that this query is using a
construction that was specifically improved in 8.4.  The advice
is still going to be the same: see if it isn't better with 8.4.

            regards, tom lane



      

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