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* partial index + select query performance
@ 2008-03-13 07:21 petchimuthu lingam <spmlingam@gmail.com>
0 siblings, 1 reply; 2+ messages in thread
From: petchimuthu lingam @ 2008-03-13 07:21 UTC (permalink / raw)
To: pgsql-performance
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.
--
With Best Regards,
Petchimuthulingam S
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: partial index + select query performance
@ 2008-03-13 07:33 A. Kretschmer <andreas.kretschmer@schollglas.com>
parent: petchimuthu lingam <spmlingam@gmail.com>
0 siblings, 0 replies; 2+ messages in thread
From: A. Kretschmer @ 2008-03-13 07:33 UTC (permalink / raw)
To: pgsql-performance
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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2008-03-13 07:21 partial index + select query performance petchimuthu lingam <spmlingam@gmail.com>
2008-03-13 07:33 ` A. Kretschmer <andreas.kretschmer@schollglas.com>
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