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The Scientific World Journal
Volume 2013 (2013), Article ID 596724, 6 pages
Research Article

A Two-Level Cache for Distributed Information Retrieval in Search Engines

School of Computer Science and Technology, Harbin Institute of Technology, P.O. Box 320, Harbin 150001, China

Received 30 July 2013; Accepted 14 November 2013

Academic Editors: J. Shu and F. Yu

Copyright © 2013 Weizhe Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


To improve the performance of distributed information retrieval in search engines, we propose a two-level cache structure based on the queries of the users’ logs. We extract the highest rank queries of users from the static cache, in which the queries are the most popular. We adopt the dynamic cache as an auxiliary to optimize the distribution of the cache data. We propose a distribution strategy of the cache data. The experiments prove that the hit rate, the efficiency, and the time consumption of the two-level cache have advantages compared with other structures of cache.