| From: | "Ross J(dot) Reedstrom" <reedstrm(at)wallace(dot)ece(dot)rice(dot)edu> |
|---|---|
| To: | pgsql-sql(at)postgreSQL(dot)org |
| Cc: | Clayton Cottingham <drfrog(at)smartt(dot)com> |
| Subject: | Re: [SQL] quest:optimization with indexes |
| Date: | 1999-08-11 14:12:57 |
| Message-ID: | 19990811091257.A2912@wallace.ece.rice.edu |
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| Lists: | pgsql-sql |
On Wed, Aug 11, 1999 at 04:30:13PM +0300, Herouth Maoz wrote:
> At 01:42 +0300 on 11/08/1999, Clayton Cottingham wrote:
> >
> > where/what rules should be followed for setting up a good indexing
> > scheme under pg?
>
<snipped Herouth's good summation of the rules of indices>
One thing to add: after adding your index, vacuum analyze you table, or else
the optimizer may thing you've only got a few rows in your table, and refuse
to use the indices, because it thinks sequential scans are relatively cheap.
Ross
--
Ross J. Reedstrom, Ph.D., <reedstrm(at)rice(dot)edu>
NSBRI Research Scientist/Programmer
Computer and Information Technology Institute
Rice University, 6100 S. Main St., Houston, TX 77005
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