计算机工程与应用 ›› 2009, Vol. 45 ›› Issue (28): 131-132.DOI: 10.3778/j.issn.1002-8331.2009.28.039

• 数据库、信号与信息处理 • 上一篇    下一篇

DTD上的lazyDFA XML数据流查询优化算法

张晓琳,崔 敏,谭跃生   

  1. 内蒙古科技大学 信息工程学院,内蒙古 包头 014010
  • 收稿日期:2008-05-27 修回日期:2008-09-05 出版日期:2009-10-01 发布日期:2009-10-01
  • 通讯作者: 张晓琳

Query optimizational algorithm about XML data stream of lazyDFA on DTD

ZHANG Xiao-lin,CUI Min,TAN Yue-sheng   

  1. Information Engineering College,Inner Mongolia University of Science and Technology,Baotou,Inner Mongolia 014010,China
  • Received:2008-05-27 Revised:2008-09-05 Online:2009-10-01 Published:2009-10-01
  • Contact: ZHANG Xiao-lin

摘要: 针对XML数据流上的XPath查询处理问题,基于自动机技术构造的lazyDFA查询处理器是一种有效的解决方法。为了提高lazyDFA的查询处理效率,提出了利用DTD的语义信息和结构信息对lazyDFA进行优化的算法。实验结果表明,优化算法可以有效的加快lazyDFA的查询速度,降低内存消耗。

关键词: 文档类型定义, lazyDFA, 查询优化, XML数据流

Abstract: A query processor called lazyDFA which is created based on the automaton technology is an effective method to solve the problem of XPath query on XML data stream.This paper proposes the optimized algorithms for lazyDFA which use the semantic and structural information of DTD in order to improve the efficiency of lazyDFA.The experimental results show that optimized algorithms can effectively accelerate lazyDFA query speed,lower memory consumption.

Key words: Document Type Definition(DTD), lazyDFA, query optimization, XML data stream

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