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Web search result caching and prefetching (Contributo in volume (capitolo o saggio))

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Web search result caching and prefetching (Contributo in volume (capitolo o saggio)) (literal)

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Lempel R.; Silvestri F. (2009)
Web search result caching and prefetching
Springer, New York (Stati Uniti d'America) in , 2009
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In: Encyclopedia of Database Systems. pp. 3501 - 3506. Ling Liu, M. Tamer Özsu (eds.). New York: Springer, 2009. (literal)

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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 ofproposed a two-level caching scheme that combines caching of search results with the caching of frequently accessed postings lists. Prefetching of search engine results was studied from a theoretical point of view by Lempel and Moran in 2002 [6]. They observed that the work involved in query evaluation scales in a sub-linear manner with the number of results computed by the search engine. Then they proceeded to minimize the computations involved in query evaluations by opti- mizing the number of results computed per query. The optimization is based on a workload function that models both (i) the computations performed by the search engine to produce search results and (ii) the probabilistic manner by which users advance through result pages in a search session. (literal)

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