Oracle FAQ Your Portal to the Oracle Knowledge Grid
HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US
 

Home -> Community -> Mailing Lists -> Oracle-L -> Bitmap index

Bitmap index

From: Bala, Prakash <prakash.bala_at_cingular.com>
Date: Mon, 05 Feb 2001 13:05:55 -0800
Message-ID: <F001.002AAF0B.20010205105633@fatcity.com>

Hi DBAs,

Oracle 8.1.6 on Sun; DW environment:

Have a table that gets populated by SQL*Loader and thereafter lots of queries go against this table using different combinations of 4 columns
(date, varchar2(6), varchar2(5), char(1)). Once a row is processed, the
char(1) column gets updated from null to 'Y'. There are no updates to any other columns or no deletes. Roughly 1000 rows gets inserted to this table every day.

When I tried 'explain plain' for different queries, I find that a bitmap index on these 4 columns performs much better than a normal index. Before implementing this, would like to get your ideas on this.

Appreciate any help!

Prakash

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Bala, Prakash
  INET: prakash.bala_at_cingular.com

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L

(or the name of mailing list you want to be removed from). You may
also send the HELP command for other information (like subscribing).
Received on Mon Feb 05 2001 - 15:05:55 CST

Original text of this message

HOME | ASK QUESTION | ADD INFO | SEARCH | E-MAIL US