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Web Search Result Caching and Prefetching

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Encyclopedia of Database Systems

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Synonyms

Paging in Web search engines; Search engine caching and prefetching; Search engine query result caching

Definition

Caching is a well-known concept in systems with multiple tiers of storage. For simplicity, consider a system storing N objects in relatively slow memory, that also has a smaller but faster memory buffer of capacity k which can store copies of k of the N objects (N > > k). This fast memory buffer is called the cache. The storage system is presented with a continuous stream of queries, each requesting one of the N objects. If the object is stored in the cache, a cache hit occurs and the object is quickly retrieved. Otherwise, a cache miss occurs, and the object is retrieved from the slower memory. At this point, the storage system can opt to save the newly retrieved object in the cache. When the cache is full (i.e., already contains k objects), this entails evicting some currently cached object. Such decisions are handled by a replacement policy, whose goal is to...

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Recommended Reading

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Author information

Authors and Affiliations

  1. Yahoo! Research, Haifa, Israel

    Ronny Lempel

  2. Yahoo Inc, London, UK

    Fabrizio Silvestri

Authors
  1. Ronny Lempel
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  2. Fabrizio Silvestri
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Corresponding author

Correspondence to Fabrizio Silvestri .

Editor information

Editors and Affiliations

  1. Georgia Institute of Technology College of Computing, Atlanta, GA, USA

    Ling Liu

  2. University of Waterloo School of Computer Science, Waterloo, ON, Canada

    M. Tamer Özsu

Section Editor information

  1. Google Research, New York, NY, USA

    Cong Yu

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Lempel, R., Silvestri, F. (2018). Web Search Result Caching and Prefetching. In: Liu, L., Özsu, M.T. (eds) Encyclopedia of Database Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8265-9_464

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