I also sent an inquiry to Tim Gorman, who wrote the article on the CBO.
He's no novice. He says the fourth join method is....
1. nested loops
2. sort merge
3. hash join
and....
4. cartesian product !
I kid you not.
By the way, if you're on 8i and haven't already set init parms
OPTIMIZER_INDEX_CACHING=90 and OPTIMIZER_INDEX_COST_ADJ to something between
10 and 50, you might really like this article he wrote, "The Search for
Intelligent Life in the CBO." Currently it's the fist article listed at
http://www.evdbt.com/library.htm
- Greg
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