Improved techniques for result caching in Web search engines

Qingqing Gan, Torsten Suel

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    Query processing is a major cost factor in operating large web search engines. In this paper, we study query result caching, one of the main techniques used to optimize query processing performance. Our first contribution is a study of result caching as a weighted caching problem. Most previous work has focused on optimizing cache hit ratios, but given that processing costs of queries can vary very significantly we argue that total cost savings also need to be considered. We describe and evaluate several algorithms for weighted result caching, and study the impact of Zipf-based query distributions on result caching. Our second and main contribution is a new set of feature-based cache eviction policies that achieve significant improvements over all previous methods, substantially narrowing the existing performance gap to the theoretically optimal (clairvoyant) method. Finally, using the same approach, we also obtain performance gains for the related problem of inverted list caching. Copyright is held by the International World Wide Web Conference Committee (IW3C2).

    Original languageEnglish (US)
    Title of host publicationWWW'09 - Proceedings of the 18th International World Wide Web Conference
    Pages431-440
    Number of pages10
    DOIs
    StatePublished - Dec 1 2009
    Event18th International World Wide Web Conference, WWW 2009 - Madrid, Spain
    Duration: Apr 20 2009Apr 24 2009

    Publication series

    NameWWW'09 - Proceedings of the 18th International World Wide Web Conference

    Other

    Other18th International World Wide Web Conference, WWW 2009
    CountrySpain
    CityMadrid
    Period4/20/094/24/09

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    Keywords

    • Index caching
    • Result caching
    • Search engines
    • Weighted caching

    ASJC Scopus subject areas

    • Computer Networks and Communications

    Cite this

    Gan, Q., & Suel, T. (2009). Improved techniques for result caching in Web search engines. In WWW'09 - Proceedings of the 18th International World Wide Web Conference (pp. 431-440). (WWW'09 - Proceedings of the 18th International World Wide Web Conference). https://doi.org/10.1145/1526709.1526768