Re: 4 join methods?

From: Greg Moore <sqlgreg_at_pacbell.net>
Date: Thu, 31 May 2001 15:55:05 -0700
Message-ID: <F001.00317310.20010531154658@fatcity.com>

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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Author: Greg Moore
  INET: sqlgreg_at_pacbell.net

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