Re: Using more tha one index per table

From: Rob Wultsch <wultsch(at)gmail(dot)com>
To: "A(dot) Kretschmer" <andreas(dot)kretschmer(at)schollglas(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Using more tha one index per table
Date: 2010-07-21 07:58:16
Message-ID: AANLkTilBKkfLTLOsiRyjY0MK8oRYqWxmNCx1PZhOMofO@mail.gmail.com
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-docs pgsql-performance

On Wed, Jul 21, 2010 at 12:53 AM, A. Kretschmer <
andreas(dot)kretschmer(at)schollglas(dot)com> wrote:

> In response to Elias Ghanem :
> > Hi,
> > I have a question concerning the uses of indexes in Postgresql.
> > I red that in PG a query can not use more than one index per table: "a
> query or
> > data manipulation command can use at most one index per table".
>
> That's not true, but it's true for MySQL, afaik.
>
>
> Andreas
> --
> Andreas Kretschmer
> Kontakt: Heynitz: 035242/47150, D1: 0160/7141639 (mehr: -> Header)
> GnuPG: 0x31720C99, 1006 CCB4 A326 1D42 6431 2EB0 389D 1DC2 3172 0C99
>
> --
> Sent via pgsql-performance mailing list (pgsql-performance(at)postgresql(dot)org)
> To make changes to your subscription:
> http://www.postgresql.org/mailpref/pgsql-performance
>

That is not true either, though MySQL is less good at using bitmap'ed
indexes. 5.0 can use "merge indexes",

--
Rob Wultsch
wultsch(at)gmail(dot)com

In response to

Responses

Browse pgsql-docs by date

  From Date Subject
Next Message Scott Marlowe 2010-07-21 08:01:00 Re: Using more tha one index per table
Previous Message A. Kretschmer 2010-07-21 07:53:53 Re: Using more tha one index per table

Browse pgsql-performance by date

  From Date Subject
Next Message Scott Marlowe 2010-07-21 08:01:00 Re: Using more tha one index per table
Previous Message A. Kretschmer 2010-07-21 07:53:53 Re: Using more tha one index per table