Istituto di Scienza e Tecnologie dell'Informazione     
Baeza-Yates R., Gionis A., Junqueira F., Murdock V., Plachouras V., Silvestri F. The impact of caching on search engines. In: 30th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval (Amsterdam, Netherland, 23-27 July 2007). Proceedings, pp. 183 - 190. ACM, 2007.
In this paper we study the trade-offs in designing efficient caching systems for Web search engines. We explore the impact of different approaches, such as static vs. dynamic caching, and caching query results vs. caching posting lists. Using a query log spanning a whole year we explore the limitations of caching and we demonstrate that caching posting lists can achieve higher hit rates than caching query answers. We propose a new algorithm for static caching of posting lists, which outperforms previous methods. We also study the problem of finding the optimal way to split the static cache between answers and posting lists. Finally, we measure how the changes in the query log affect the effectiveness of static caching, given our observation that the distribution of the queries changes slowly over time. Our results and observations are applicable to different levels of the data-access hierarchy, for instance, for a memory/disk layer or a broker/remote server layer.
URL: http://delivery.acm.org/10.1145/1280000/1277775/p183-baeza-yates.pdf?key1=1277775&key2=5600739911&coll=ACM&dl=ACM&CFID=48444947&CFTOKEN=77545601
Subject Caching
Web search
Information retrieval systems
H.3.3 Information Search and Retrieval. Search process
H.3.4 Systems and Software. Distributed systems
H.3.4 Systems and Software. Performance evaluation (efficiency and effectiveness)

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