NDLI: Accelerating XPath evaluation in any RDBMS

Content Provider	ACM Digital Library
Author	Teubner, Jens Grust, Torsten Keulen, Maurice Van
Copyright Year	2004
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 $\textit{all}$ 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 $\textit{existing}$ 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.
Starting Page	91
Ending Page	131
Page Count	41
File Format	PDF
ISSN	03625915
e-ISSN	15574644
DOI	10.1145/974750.974754
Volume Number	29
Issue Number	1
Journal	ACM Transactions on Database Systems (TODS)
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2004-03-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Main-memory databases XML XML indexing XPath
Content Type	Text
Resource Type	Article
Subject	Information Systems

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