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      •   BUIR Home
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      • Bilkent Theses
      • Theses - Department of Computer Engineering
      • Dept. of Computer Engineering - Master's degree
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      A result cache invalidation scheme for web search engines

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      Author
      Alıcı, Şadiye
      Advisor
      Ulusoy, Özgür
      Date
      2011
      Publisher
      Bilkent University
      Language
      English
      Type
      Thesis
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      Abstract
      The result cache is a vital component for the efficiency of large-scale web search engines, and maintaining the freshness of cached query results is a current research challenge. As a remedy to this problem, our work proposes a new mechanism to identify queries whose cached results are stale. The basic idea behind our mechanism is to maintain and compare the generation time of query results with the update times of posting lists and documents to decide on staleness of query results. The proposed technique is evaluated using a Wikipedia document collection with real update information and a real-life query log. Throughout the experiments, we compare our approach with two baseline strategies from literature together with a detailed evaluation. We show that our technique has good prediction accuracy, relative to the baseline based on the time-to-live (TTL) mechanism. Moreover, it is easy to implement and it incurs less processing overhead on the system relative to a recently proposed, more sophisticated invalidation mechanism.
      Keywords
      Web search
      result cache
      cache invalidation
      time-to-live
      freshness
      adaptive
      Permalink
      http://hdl.handle.net/11693/15243
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      • Dept. of Computer Engineering - Master's degree 516
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