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Document Type

Journal Article

Department/Unit

Department of Computer Science

Title

Optimizing updates of recursive XML views of relations

Language

English

Abstract

XML publishing has been an emerging technique for transforming (portions of) a relational database into an XML document, for example, to facilitate interoperability between heterogeneous applications. Such applications may update the XML document and the source relational database must be updated accordingly. In this paper, we consider such XML documents as (possibly) recursively defined XML views of relations. We propose new optimization techniques to efficiently support XML view updates specified via an XPATH expression with recursion and complex filters. The main novelties of our techniques are: (1) we propose a space-efficient relational encoding of recursive XML views; and (2) we push the bulk of update processing inside a relational database. Specifically, a compressed representation of the XML views is stored as extended shared-inlining relations. A space-efficient and updatable 2-hop index is used to optimize XPATH evaluation on XML views. Updates of the XML views are evaluated on these relations and index. View update translation is handled by a heuristic procedure inside a relational database, as opposed to previous middleware approaches. We present an experimental study to demonstrate the effectiveness of our proposed techniques. © 2009 Springer-Verlag.

Keywords

View updates, XML publishing, XML view updates

Publication Date

2009

Source Publication Title

VLDB Journal

Volume

18

Issue

6

Start Page

1313

End Page

1333

Publisher

Springer Verlag

ISSN (print)

10668888

ISSN (electronic)

0949877X

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