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Bitmap Join Index Exclusions

Update:11-30Source: network consolidation
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Hi,
I have come across the following statement in some of the oracle Db related forums
'For queries that have additional criteria in the WHERE clause that doesn't appear in the bitmap join index, Oracle9i will be unable to use this index to service the query.'
Does this stand good for oracle 11gr2 also?

The Best Answer

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Here is two good articles about bitmap join indexes,
http://articles.techrepublic.com.com/5100-10878_11-1051931.html
http://www.lorentzcenter.nl/awcourse/oracle/server.920/a96520/indexes.htm
Bitmap Join Indexes have the following restrictions:
1. Parallel DML is currently only supported on the fact table. Parallel DML on one of the participating dimension tables will mark the index as unusable.
2. Only one table can be updated concurrently by different transactions when using the bitmap join index.
3. No table can appear twice in the join.
4. You cannot create a bitmap join index on an index-organized table or a temporary table.
5. The columns in the index must all be columns of the dimension tables.
6. The dimension table join columns must be either primary key columns or have unique constraints.
7. If a dimension table has composite primary key, each column in the primary key must be part of the join.
Thanks
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