| From: | Richard Huxton <dev(at)archonet(dot)com> |
|---|---|
| To: | "Luiz Rafael Culik Guimaraes" <culikr(at)brturbo(dot)com>, <pgsql-sql(at)postgresql(dot)org> |
| Cc: | <pgsql-general(at)postgresql(dot)org> |
| Subject: | Re: [SQL] query optimizer dont treat correctly OR |
| Date: | 2004-04-27 15:35:39 |
| Message-ID: | 200404271635.39024.dev@archonet.com |
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| Thread: | |
| Lists: | pgsql-general pgsql-sql |
On Tuesday 27 April 2004 15:48, Luiz Rafael Culik Guimaraes wrote:
> Hello folks
>
> See the command bellow. I use some thing simmilar about an decade on
> Oracle,
> Sybase, MSSQL, DB2, etc. But with Postgresql , he generate an FULL TABLE
> SCAN,
> and consequenyly it take about 10 minutes to run (Very big table..)
> Why Post do this wrong julgment with the initial command?
> Exist some thing that i can configure to to make postgres works correctly ?
You'll need to post the output of EXPLAIN ANALYSE for your query. This will
show how many rows PG thinks it will get back compared to how many it
actually gets back.
--
Richard Huxton
Archonet Ltd
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