Optimiser inconsistency

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Greetings,

we have only recently installed Oracle 8i within our Organisation and have experienced some rather strange behavioural patterns associated with the optimiser's interpretation.

Attached is a printout which demonstrates Oracle's decision to go for a full hash join of two tables A and B even when table A is very small and table B is indexed on the join key and is very large.

I have read a lot of relevant documentation (esp. Oracle 8i Designing & Tuning for Performance, The Optimiser, Chapter 4) and altered all session variables mentioned therein ... with no result ... ie. I do not believe the behaviour is caused by our setup.

I would appreciate your thoughts.

cheers,
Grant

(See attached file: out.dat)

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Received on Tue Oct 10 2000 - 17:24:18 CDT