Query plan selection control using run-time association mechanism
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United States of America Patent
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Dec 29, 2009
Grant Date -
Oct 5, 2006
app pub date -
Apr 5, 2005
filing date -
Apr 5, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system and method for creation, modification and/or use of plan guide(s) is provided. Plan guide(s) can be employed to optimize the performance of query(ies) when it is not possible and/or desirable to change the text of the query directly. Plan guides can be useful, for example, when a small subset of queries in a database application deployed from a third-party vendor is not performing as expected. Plan guides influence optimization of queries by attaching query hints to them. In accordance with an aspect of the subject invention, a query plan execution system is provided. The system includes an execution component, a query optimizer, and, a plan cache. Plan guides and other associated metadata are stored in a plan guide metadata store.
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