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Infrequent word index for document indexes

  • US 20050165750A1
  • Filed: 01/20/2004
  • Published: 07/28/2005
  • Est. Priority Date: 01/20/2004
  • Status: Abandoned Application
First Claim
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1. For use with a search engine that processes user queries, a system that locates documents containing words corresponding to a user query comprising;

  • an infrequent word identifier that identifies infrequent words that occur in less than a threshold number of documents;

    a frequent word index that maps the location of documents that contain words that occur in more than the threshold number of documents;

    an infrequent word index, maintained separately from the frequent word index, that maps the location of documents that contain infrequent words;

    an index scanning component that, in response to a query containing an infrequent word, scans the infrequent word index to find the location of documents containing the infrequent word.

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