check: http://www.postgresql.org/docs/7.3/interactive/geqo.html”optimization effort is caused by the support of a variety of join methods (e.g., nested loop, hash join, merge join in PostgreSQL) to process individual joins and a diversity of indexes (e.g., R-tree, B-tree, hash in PostgreSQL) as access paths for relations. ”
“The current PostgreSQL optimizer implementation performs a near-exhaustive search over the space of alternative strategies. This query optimization technique is inadequate to support database application domains that involve the need for extensive queries, such as artificial intelligence. ”
From: http://sitestree.com/?p=4716
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Post Data:2013-01-25 12:41:08
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