Performance of views

Hi!

Some of our developers are having concerns about using views in the application. So they approached me and wanted to clarify some of their issues.

When I issues a "select * from viewname", Oracle executes the underlying select statement of the view. This underlying statement should be optimized
(using availabale indexes on tables etc.)

If I issue a "select * from viewname where condition < 3" or the like, will the indexes still be used. Or how is this statement executed? Does Oracle first run the underlying select statement and then apply the "where condition < 3" to the returned result set? Or is the statement being rewritten internally?

The Oracle documentation is not very clear on this. Any ideas would be appreciated.

This is 8.1.6 on Win2k.

Thanks,
Helmut

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
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Author: Helmut Daiminger
  INET: hdaiminger_at_vivonet.com

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