CACHING PLANS WITH USING DATA VALUES
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United States of America Patent
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Issued Date -
Aug 21, 2008
app pub date -
Feb 21, 2007
filing date -
Feb 21, 2007
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method of selecting for use a stored execution plan for a dynamic SQL query within a database system. Respective selectivity values are maintained that are associated with one or more predicates in the dynamic SQL query for respective historical data values. Respective confidence level values are maintained that are associated with one or more of the selectivity values. One or more data values are received with which to execute the dynamic SQL query. Respective selectivity values are calculated for one or more of the predicates in the dynamic SQL query for the received data value(s). The stored selectivity values are compared with respective corresponding calculated selectivity values. A stored execution plan is selected for use on detecting substantial equality between the respective pairs of compared values.
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