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An Effective Semantic Cache for Exploiting XPath Query/View Answerability

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Abstract

Maintaining a semantic cache of materialized XPath views inside or outside the database is a novel, feasible and efficient approach to facilitating XML query processing. However, most of the existing approaches incur the following disadvantages: 1) they cannot discover enough potential cached views sufficiently to effectively answer subsequent queries; or 2) they are inefficient for view selection due to the complexity of XPath expressions. In this paper, we propose SCEND, an effective Semantic Cache based on dEcompositioN and Divisibility, to exploit the XPath query/view answerability. The contributions of this paper include: 1) a novel technique of decomposing complex XPath queries into some much simpler ones, which can facilitate discovering more potential views to answer a new query than the existing methods and thus can adequately exploit the query/view answerability; 2) an efficient view-section method by checking the divisibility between two positive numbers assigned to queries and views; 3) a cache-replacement approach to further enhancing the query/view answerability; 4) an extensive experimental study which demonstrates that our approach achieves higher performance and outperforms the existing state-of-the-art alternative methods significantly.

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Authors and Affiliations

  1. Department of Computer Science and Technology, Tsinghua National Laboratory for Information Science and Technology, Tsinghua University, Beijing, 100084, China

    Guo-Liang Li (Member, CCF, ACM) & Jian-Hua Feng (Senior Member, CCF, Member, ACM, IEEE)

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  1. Guo-Liang Li
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  2. Jian-Hua Feng
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Correspondence to Guo-Liang Li.

Additional information

This work is partly supported by the National Natural Science Foundation of China under Grant No. 60873065, the National High Technology Research and Development 863 Program of China under Grant Nos. 2007AA01Z152 and 2009AA011906, and the National Basic Research 973 Program of China under Grant No. 2006CB303103.

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Li, GL., Feng, JH. An Effective Semantic Cache for Exploiting XPath Query/View Answerability. J. Comput. Sci. Technol. 25, 347–361 (2010). https://doi.org/10.1007/s11390-010-9328-y

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  • DOI: https://doi.org/10.1007/s11390-010-9328-y

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