MPX: a multiversion concurrency control protocol for XML documents

Authors:
Yuan Wang;Gang Chen;Jin-xiang Dong
Affiliations:
College of Computer Science, Zhejiang University, Hangzhou, Zhejiang, P.R. China;College of Computer Science, Zhejiang University, Hangzhou, Zhejiang, P.R. China;College of Computer Science, Zhejiang University, Hangzhou, Zhejiang, P.R. China
Venue:
WAIM'05 Proceedings of the 6th international conference on Advances in Web-Age Information Management
Year:
2005

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Abstract

With the rapid popularity of XML, especially in web-base applications, concurrency control of XML documents becomes an important issue. In this paper, we present MPX, a multiversion concurrency control protocol for XML documents, which is designed for synchronizing concurrent queries and modifications of XML documents stored in a native XML databases or XML document repository. Distinguished from other existing protocols, MPX ensures serializability, recoverability and cascadelessness. Furthermore, MPX also guarantees read-only transactions and update transactions will never block each other, which is especially beneficial for XML for queries on XML are much more frequent than updates. Plenty of experiments have also been carried out, confirming that MPX can ensure a better degree of concurrency and less rollbacks.