Database system providing methodology for property enforcement
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United States of America Patent
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Oct 5, 2004
Grant Date -
Sep 11, 2003
app pub date -
Oct 30, 2002
filing date -
Mar 6, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A database system providing methods for eager and opportunistic property enforcement is described. Plan fragments are generated for obtaining data requested by a query. Plan fragments are grouped together in classes based upon tables of the database covered by each plan fragment. For each class, a particular plan fragment having the lowest execution costs for obtaining the data requested by the query is determined. If grouping is not required at a given class, an operator enforcing ordering is added to this particular sub-plan. However, if grouping is required at the given class, an operator enforcing both grouping and ordering is added to this sub-plan.
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