Postgres Pro
Downloads
Home   >   mailing lists

Re: partial index + select query performance - Mailing list pgsql-performance

From A. Kretschmer
Subject Re: partial index + select query performance
Date
Msg-id 20080313073346.GC22306@a-kretschmer.de
Whole thread Raw
In response to partial index + select query performance  ("petchimuthu lingam" <spmlingam@gmail.com>)
List pgsql-performance
Tree view 
am  Thu, dem 13.03.2008, um 12:51:54 +0530 mailte petchimuthu lingam folgendes:
>
> I have created partial index on a field with conditions, if   field _a > 200
> and field_a  < 300.
>
> I using the select query with condition as field_a in ( 100, 250, 289,  ),
>
> Will it use the index.

Why do you ask us, ask your PG, simple type

explain select ... from ... where field_a in ( 100, 250, 289 )


PG shows you the execution plan. But i guess, the index are not used,
because the value 100 are not in the index.


Andreas
--
Andreas Kretschmer
Kontakt:  Heynitz: 035242/47150,   D1: 0160/7141639 (mehr: -> Header)
GnuPG-ID:   0x3FFF606C, privat 0x7F4584DA   http://wwwkeys.de.pgp.net

pgsql-performance by date:

Previous
From: "petchimuthu lingam"
Date:
Subject: partial index + select query performance
Next
From: "Justin Graf"
Date:
Subject: Re: Benchmark: Dell/Perc 6, 8 disk RAID 10