We had a question recently on the list about RBO still physically being there in 10g or not. I asked Graham Wood in Development, and here's his reply:
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RBO is still there.
De-supported means that if you find a bug, such as wrong results, in RBO it will not be fixed, and you will be told to use CBO instead. Bugs such as poor performing plans haven't been fixed in RBO for a long time.
Additionally the default optimizer mode will be all_rows, rather than choose.
There was a paper by George Lumpkin at OW called RBO R.I.P. which had this stuff in it.
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Best regards,
Mogens
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