Which switch to index for the index bitmap in Oracle Standard Edition

Hello

I have to move from Oracle Enterprise edition to standard edition (oracle11g). As standard edition does not support bitmap indexes. But the current database which is an Enterprise edition a bitmap index a column-based date or varchar2 or column in a table. The tables have approximately 60000000 records. I would like to know what index go for bitmap index.


Kind regards
Vaibhav

Published by: Vaibhav on November 7, 2011 05:35

The BTree index certainly can and are frequently used when values are not unique (e.g. are duplicated).

uniqueness isn't the issue. The relative number of distinct values (relative to the total number of lines) is important. An advantage of BitMap index BTree indexes, it's that BTree indexes can be composite - made up of multiple columns.

You can read the documentation on the index.

http://download.Oracle.com/docs/CD/E11882_01/server.112/e25789/indexiot.htm#CBBECABB

http://download.Oracle.com/docs/CD/E11882_01/server.112/e25494/indexes.htm#i1007132

Hemant K Collette

Tags: Database

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