To answer your question "does oracle use histograms and distinctness in determining join order?" outright: Yes, but only indirectly: histograms and distinctness determine the cardinality -> therefore the cost estimates -> therefore the join order.
And lastly, you can not compare the results, i.e. plans, of two different parses. Each is in its own world.
At 10:04 AM 11/5/2003, you wrote:
im not concerned about the type of join. Im strictly concerned about the join order. does oracle use histograms and distinctness in determining join order? The odd thing is that it chose a different join order on these tables earlier and on 'similiar' joins(ie large number of records and only 4 distinct values on the join column) oracle chooses the proper join 'order'
>
Wolfgang Breitling
Oracle7, 8, 8i, 9i OCP DBA
Centrex Consulting Corporation
http://www.centrexcc.com
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