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Selecting candidate queries

  • US 20060041537A1
  • Filed: 08/17/2004
  • Published: 02/23/2006
  • Est. Priority Date: 08/17/2004
  • Status: Active Grant
First Claim
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1. A method of processing a query, comprising:

  • determining which particular candidate identification technique, of two or more candidate identification techniques available to a query-processing unit, to use to process the query;

    wherein each candidate identification technique is a technique for identifying which semantically equivalent queries, of all possible semantically equivalent queries, will belong to a particular set of candidate queries;

    determining an initial set of candidate queries for the query based on the particular candidate identification technique;

    determining costs for one or more particular queries of the initial set of candidate queries;

    choosing a particular query, from a set of candidate queries, based on costs for each query in the set of candidate queries, wherein the set of candidate queries includes the one or more particular queries; and

    responding to a request to execute the query by executing the particular query.

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