Query results caching and prefetching is an effective way to enhance the performance of Web search engines. We present an analysis of query logs originated from a famous Chinese Web search engine and describe the characteristics of Web search engine queries. A query results caching and prefetching approach based on query characteristics is proposed in this paper. The approach contains predictive models of query results page number and a caching and prefetching algorithm framework in Web search engines. We then use a real large scale query logs for a period of 2-months to evaluate the approach) in contrast to the traditional methods and theoretical upper bounds. Experimental results show that this approach can achieve 3. 5% to 8. 45% increase for all requests as compared with state-of-the-art methods.%针对搜索引擎查询结果缓存与预取问题,该文提出了一种基于查询特性的搜索引擎查询结果缓存与预取方法,该方法包括用来指导预取的查询结果页码预测模型和缓存与预取算法框架,用于提高搜索引擎系统性能.通过对国内某著名中文商业搜索引擎的某段时间的用户查询日志分析得出,用户对不同查询返回的查询结果所浏览的页数具有显著的非均衡性,结合该特性设计查询结果页码预测模型来进行预取和分区缓存.在该搜索引擎两个月的大规模真实用户查询日志上的实验结果表明,与传统的方法相比,该方法可以获得3.5％～8.45％的缓存命中率提升.
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