From: Bruce Momjian <pgman@candle.pha.pa.us>
To: Rajesh Kumar Mallah. <mallah@trade-india.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: BITMAP INDEXES...
Date: Thu, 22 Aug 2002 10:30:39 -0400 (EDT)
Message-ID: <200208221430.g7MEUdA27489@candle.pha.pa.us> (raw)
In-Reply-To: <200208221352.24278.mallah@trade-india.com>
See the email about bitmapped indexes linked to from the TODO list item
on bitmaps. Bitmap indexes allow arbitrary indexes to be combined into
a single index. Btree indexes can not be combined.
---------------------------------------------------------------------------
Rajesh Kumar Mallah. wrote:
> Hi,
>
> I have learnt from certain texts that bitmap indexes are very useful for
> large DSS (decesion support systems).
>
> bitmap indexes are currently not available in postgresql.
>
> My question is in what way is a normal btree index in pgsql
> inferior to bitmap indexes (found in oracle for example).
>
> is it just in terms of space requirements for performance too?
>
>
> regds
> mallah.
>
>
> --
> Rajesh Kumar Mallah,
> Project Manager (Development)
> Infocom Network Limited, New Delhi
> phone: +91(11)6152172 (221) (L) ,9811255597 (M)
>
> Visit http://www.trade-india.com ,
> India's Leading B2B eMarketplace.
>
>
>
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--
Bruce Momjian | http://candle.pha.pa.us
pgman@candle.pha.pa.us | (610) 359-1001
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To: pgsql-sql@postgresql.org
Cc: pgman@candle.pha.pa.us, mallah@trade-india.com
Subject: Re: BITMAP INDEXES...
In-Reply-To: <200208221430.g7MEUdA27489@candle.pha.pa.us>
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