Re: Confirmation of bad query plan generated by 7.4

>>> On 6/13/2006 at 9:13 PM, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)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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