Reducing index size for multi-level grid indexes
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United States of America Patent
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Dec 28, 2010
Grant Date -
Feb 23, 2006
app pub date -
Oct 20, 2005
filing date -
May 10, 2002
priority date (Note) -
Expired
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Abstract
Techniques of querying an index of first objects comprised of a plurality of index entries and a pool of second objects are provided. The techniques include evaluating the index of the first objects to produce a group of one or more possible candidates based on whether one or more index entries of the first objects satisfy a query, adding second objects from the pool to said group of possible candidates to produce an interim group of possible candidates, filtering the interim group of possible candidates by comparing approximations of the candidates of the interim group with the query to produce filtered candidate objects, and determining if the filtered candidate objects satisfy the query by comparing the first and second objects corresponding to the filtered candidate objects with the query.
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