Bitmap index

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

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Author: Bala, Prakash
  INET: prakash.bala_at_cingular.com

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