Cost-based Query Optimization for XPath

Authors

Dong Li, School of Software Engineering, South China University of Technology, Guangzhou 510006, P. R. ChinaFollow
Wenhao Chen
Xiaochong Liang
Jida Guan
Yang Xu
Xiuyu Lu

Author Country (or Countries)

P. R. China

Abstract

In this article, we address the issues which are related to the cost-based XML query optimization for XPath. Specially, we focus on the issue of how to determine the execution order for a given XPath expression according to the cost models. The main impact factor that dominates the execution order is the size of the intermediate results during the evaluation of queries. The hierarchy encoding scheme and the value-encoding histogram are introduced to support the size estimation of the path expressions. Two cost models are proposed to describe the costs of different types of join operations in the path expressions. A heuristic-based dynamic programming approach is proposed to determine the optimal execution tree. The primary experimental results demonstrate the validity of our approaches.

Suggested Reviewers

N/A

Digital Object Identifier (DOI)

http://dx.doi.org/10.12785/amis/080452

Recommended Citation

Li, Dong; Chen, Wenhao; Liang, Xiaochong; Guan, Jida; Xu, Yang; and Lu, Xiuyu (2014) "Cost-based Query Optimization for XPath," Applied Mathematics & Information Sciences: Vol. 08: Iss. 4, Article 52.
DOI: http://dx.doi.org/10.12785/amis/080452
Available at: https://digitalcommons.aaru.edu.jo/amis/vol08/iss4/52