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Information Resources Management Association
Advancing the Concepts & Practices of Information Resources Management in Modern Organizations

On the Document Storage and Query Evaluation Optimization

On the Document Storage and Query Evaluation Optimization
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Author(s): Yangjun Chen (University of Winnipeg, Canada) and Gerald Huck (IPSI Institute, Germany)
Copyright: 2002
Pages: 6
Source title: Issues & Trends of Information Technology Management in Contemporary Organizations
Source Editor(s): Mehdi Khosrow-Pour, D.B.A. (Information Resources Management Association, USA)
DOI: 10.4018/978-1-930708-39-6.ch119
ISBN13: 9781930708396
EISBN13: 9781466641358


Java is a prevailing implementation platform for XML based systems. Several high quality in-memory im­plementations for the standardized XML-DOM API are available. However, persistency support has not been ad­dressed. In this paper, we discuss this problem and intro­duce PDOM (persistent DOM) to accommodate documents as permanent object sets. In addition, we propose a new in­dexing technique: path signatures to speed up the evalua­tion of path-oriented queries against document object sets, which is further enhanced by combining the technique of pat-trees with it to expedite scanning of signatures. Experiments were performed to show that this technique brings really substantial advantages.

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