From: | "Jim C(dot) Nasby" <jim(at)nasby(dot)net> |
---|---|
To: | pgsql-performance(at)postgresql(dot)org |
Subject: | Re: Odd explain estimate |
Date: | 2003-07-31 22:59:59 |
Message-ID: | 20030731225959.GH55392@nasby.net |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-performance |
On Thu, Jul 31, 2003 at 04:59:21PM -0400, Andrew Sullivan wrote:
> On Thu, Jul 31, 2003 at 02:51:45PM -0500, Jim C. Nasby wrote:
> If you really needed to set enable_seqscan=false (did you really?
> Are you sure that's not the cheapest way?), you might want to
> investigate expainding the statistics on the indexed column,
> increasing the correlation through clustering, and other such tricks.
Well, if I don't do this it wants to seqscan a table that occupies 350k
pages, instead of pulling a couple thousand rows. I started running it
with the seqscan and it's already taken way longer than it does if I
disable seqscan.
I guess I'll try expanding the statistics.
--
Jim C. Nasby, Database Consultant jim(at)nasby(dot)net
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