DERIVED STATISTICS FOR QUERY OPTIMIZATION
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United States of America Patent
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Issued Date -
Jan 27, 2011
app pub date -
Jul 27, 2009
filing date -
Jul 27, 2009
priority date (Note) -
Abandoned
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Abstract
A method and system for maintaining derived statistics within a database system. The method includes associating initial statistical information with at least one relation within the database system; composing derived statistics involving the at least one relation; deriving distinctiveness information including at least one relation; and augmenting the derived statistics with the derived distinctiveness information. The derived statistics are associated with the at least one relation. The initial statistical information and the derived statistics are exposed to a query optimizer.
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