Message-Id: <448FD794.8F27.00A9.0@leapfrogonline.com>
Date: Wed, 14 Jun 2006 09:32:04 -0500
From: "Shaun Thomas" <sthomas@leapfrogonline.com>
To: "Tom Lane" <tgl@sss.pgh.pa.us>
Cc: "Jim C. Nasby" <jnasby@pervasive.com>, <pgsql-performance@postgresql.org>
Subject: Re: Confirmation of bad query plan generated by 7.4
References: <9119.1150222168@sss.pgh.pa.us>
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	<20060613211347.GB34196@pervasive.com>
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	<20060613215418.GI34196@pervasive.com>
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In-Reply-To: <448EF8B2.8F27.00A9.0@leapfrogonline.com><448EF8B2.8F27.00A9
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>>> On 6/13/2006 at 9:13 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:

> Read what you wrote, and rethink...

Hah.  Yes, I understand the irony of that statement, but the point is
that the value of the variable won't change during query execution.

> If you're desperate you can construct a query string with the
variable
> value embedded as a literal, and then EXECUTE that.  This isn't a
great
> solution since it forces a re-plan on every execution.

That's so gross... but it might work.  I'm not really desperate, just
frustrated.  I really can't wait until we can upgrade; 7.4 is driving
me nuts.  I'm not really worried about a re-plan, since this SP just
updates a fact table, so it only gets called twice a day.  Cutting the
execution time of the SP down to < 20 seconds from 15 minutes would be
nice, but not absolutely required.  I was just surprised at the large
difference in manual execution as opposed to the SP with the same
query.

> We've occasionally debated ways to do it better, but no such
> improvement will ever appear in 7.4 ;-)

Agreed!  When we finally upgrade, I fully plan on putting a symbolic
bullet into our old installation. ;)

Thanks!


-- 

Shaun Thomas
Database Administrator

Leapfrog Online 
807 Greenwood Street 
Evanston, IL 60201 
Tel. 847-440-8253
Fax. 847-570-5750
www.leapfrogonline.com


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