Accelerating XPath Evaluation in Any RDBMS


Grust, Torsten and Keulen, M. van and Teubner, J. (2004) Accelerating XPath Evaluation in Any RDBMS. ACM Transactions on Database Systems, 29 (1). pp. 91-131. ISSN 0362-5915

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Abstract:This article is a proposal for a database index structure, the XPath accelerator, that has been specifically designed to support the evaluation of XPath path expressions. As such, the index is capable to support all XPath axes (including ancestor, following, preceding-sibling, descendant-or-self, etc.). This feature lets the index stand out among related work on XML indexing structures which had a focus on the child and descendant axes only. The index has been designed with a close eye on the XPath semantics as well as the desire to engineer its internals so that it can be supported well by existing relational database query processing technology: the index (a) permits set-oriented (or, rather, sequence-oriented) path evaluation, and (b) can be implemented and queried using well-established relational index structures, notably B-trees and R-trees. We discuss the implementation of the XPath accelerator on top of different database backends and show that the index performs well on all levels of the memory hierarchy, including disk-based and main-memory based database systems.
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Copyright:© 2004 Association for Computing Machinery
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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