Second Chance: A Hybrid Approach for Dynamic Result Caching and Prefetching in Search Engines

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Date

2013-12-01

Author

Ozcan, Rifat
Altıngövde, İsmail Sengör
Barla Cambazoglu, B.
ULUSOY, ÖZGÜR

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Web search engines are known to cache the results of previously issued queries. The stored results typically contain the document summaries and some data that is used to construct the final search result page returned to the user. An alternative strategy is to store in the cache only the result document IDs, which take much less space, allowing results of more queries to be cached. These two strategies lead to an interesting trade-off between the hit rate and the average query response latency. In this work, in order to exploit this trade-off, we propose a hybrid result caching strategy where a dynamic result cache is split into two sections: an HTML cache and a docID cache. Moreover, using a realistic cost model, we evaluate the performance of different result prefetching strategies for the proposed hybrid cache and the baseline HTML-only cache. Finally, we propose a machine learning approach to predict singleton queries, which occur only once in the query stream. We show that when the proposed hybrid result caching strategy is coupled with the singleton query predictor, the hit rate is further improved.

Subject Keywords

Computer Networks and Communications

URI

https://hdl.handle.net/11511/38291

Journal

ACM TRANSACTIONS ON THE WEB

DOI

https://doi.org/10.1145/2536777

Collections

Department of Computer Engineering, Article

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Second Chance: A Hybrid Approach for Dynamic Result Caching in Search Engines Altıngövde, İsmail Sengör; Barla Cambazoglu, B.; Ulusoy, Ozgur (2011-01-01) Result caches are vital for efficiency of search engines. In this work, we propose a novel caching strategy in which a dynamic result cache is split into two layers: an HTML cache and a docID cache. The HTML cache in the first layer stores the result pages computed for queries. The docID cache in the second layer stores ids of documents in search results. Experiments under various scenarios show that, in terms of average query processing time, this hybrid caching approach outperforms the traditional approac...
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Citation Formats

R. Ozcan, İ. S. Altıngövde, B. Barla Cambazoglu, and Ö. ULUSOY, “Second Chance: A Hybrid Approach for Dynamic Result Caching and Prefetching in Search Engines,” ACM TRANSACTIONS ON THE WEB, pp. 0–0, 2013, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/38291.