Re: Odd explain estimate
От | Jim C. Nasby |
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Тема | Re: Odd explain estimate |
Дата | |
Msg-id | 20030731225959.GH55392@nasby.net обсуждение исходный текст |
Ответ на | Re: Odd explain estimate (Andrew Sullivan <andrew@libertyrms.info>) |
Ответы |
Re: Odd explain estimate
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Список | 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@nasby.net Member: Triangle Fraternity, Sports Car Club of America Give your computer some brain candy! www.distributed.net Team #1828 Windows: "Where do you want to go today?" Linux: "Where do you want to go tomorrow?" FreeBSD: "Are you guys coming, or what?"
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