| From: | Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us> |
|---|---|
| To: | mlw <markw(at)mohawksoft(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Andrew Sullivan <andrew(at)libertyrms(dot)info>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Index Scans become Seq Scans after VACUUM ANALYSE |
| Date: | 2002-04-18 13:35:15 |
| Message-ID: | 200204181335.g3IDZFv27667@candle.pha.pa.us |
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| Lists: | pgsql-hackers |
mlw wrote:
> I don't think we will agree, we have seen different behaviors, and our
> experiences seem to conflict. This however does not mean that either of us is
> in error, it just may mean that we use data with very different
> characteristics.
>
> This thread is kind of frustrating for me because over the last couple years I
> have seen this problem many times and the answer is always the same, "The
> statistics need to be improved." Tom, you and I have gone back and forth about
> this more than once.
>
Have you tried reducing 'random_page_cost' in postgresql.conf. That
should solve most of your problems if you would like more index scans.
--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
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