From: A. Kretschmer <andreas.kretschmer@schollglas.com>
To: pgsql-performance@postgresql.org
Subject: Re: partial index + select query performance
Date: Thu, 13 Mar 2008 08:33:46 +0100
Message-ID: <20080313073346.GC22306@a-kretschmer.de> (raw)
In-Reply-To: <cd233fc30803130021h3dbfdea4m3db755677b2b14a0@mail.gmail.com>
References: <cd233fc30803130021h3dbfdea4m3db755677b2b14a0@mail.gmail.com>
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
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Andreas Kretschmer
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To: pgsql-performance@postgresql.org
Cc: andreas.kretschmer@schollglas.com
Subject: Re: partial index + select query performance
In-Reply-To: <20080313073346.GC22306@a-kretschmer.de>
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