Can we put INDEXES on Views if not Is there any way to make it Index bas

Hi
I am running a query in which there are several views involved in the join condition Can we put INDEXES on Views in ORACLE 9i if not Is there any way to make it Index based views beacuse the result that i am getting is very slow and is eating like 10gb of the temp tablespace.
Thanks

No, you cannot put indexes on a view. Think about what a view is, a stored sql statement. Oracle has no way of knowing what rows are in a view until it actually runs the view. So, even if you could, Oracle would need to run the view to get the rows, build the index, then run your query a second time using the index. Seems counter productive to me. A view can use indexes on the underlying tables if appropriate.
Generally speaking, I would say that a query that makes use of multiple views is probably really inefficient. Often, you are only looking for one or two columns from a view which may require joining several tables whose columns are of no use in the main query. I would start by re-writing the query using the base tables, and only using those tables that are actually required to answer the question.
TTFN
John

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