Multiple materialized view selection for XPath query rewriting

Nan Tang*, Jeffrey Xu Yu, M. Tamer Özsu, Koon Kau CHOI, Kam Fai Wong

*Corresponding author for this work

Research output: Chapter in book/report/conference proceedingConference proceedingpeer-review

40 Citations (Scopus)


We study the problem of answering XPATH queries using multiple materialized views. Despite the efforts on answering queries using single materialized view, answering queries using multiple views remains relatively new. We address two important aspects of this problem: multiple-view selection and equivalent multiple-view rewriting. With regards to the first problem, we propose an NFA-based approach (called VFILTER) to filter views that cannot be used to answer a given query. We then present the criterion for multiple view/query answerability. Based on the output of VRLTER, we further propose a heuristic method to identify a minimal view set that can answer a given query. For the problem of multiple-view rewriting, we first refine the materialized fragments of each selected view (like pushing selection), we then join the refined fragments utilizing an encoding scheme. Finally, we extract the result of the query from the materialized fragments of a single view. Experiments show the efficiency of our approach.

Original languageEnglish
Title of host publicationProceedings of the 2008 IEEE 24th International Conference on Data Engineering, ICDE'08
Number of pages10
Publication statusPublished - 2008
Event24th IEEE International Conference on Data Engineering, ICDE 2008 - Cancun, Mexico
Duration: 7 Apr 200812 Apr 2008

Publication series

NameProceedings - International Conference on Data Engineering
ISSN (Print)1084-4627


Conference24th IEEE International Conference on Data Engineering, ICDE 2008

Scopus Subject Areas

  • Software
  • Signal Processing
  • Information Systems


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