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Multiple index based information retrieval system

  • US 9,361,331 B2
  • Filed: 03/13/2013
  • Issued: 06/07/2016
  • Est. Priority Date: 07/26/2004
  • Status: Active Grant
First Claim
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1. A computer implemented method of indexing documents of a document collection, wherein each indexed document has a document identifier, the method comprising:

  • storing a posting list of identifiers of documents of the document collection that contain a phrase;

    partitioning the posting list, by operation of at least one processor, into at least a first portion including identifiers of higher ranked documents and a second portion including identifiers of lesser ranked documents, the partitioning being based on a relevance score for a document identified in the posting list indicating the document'"'"'s relevance to the phrase;

    storing the first portion in a primary index; and

    storing the second portion in a secondary index.

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