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Influences of Functional Dependencies on Bucket-Based Rewriting Algorithms

  • Qingyuan Bai
  • Jun Hong
  • Hui Wang
  • Michael F. McTear
Part of the Lecture Notes in Computer Science book series (LNCS, volume 3739)

Abstract

There are several algorithms for the problem of query rewriting using views, including the bucket-based algorithms and the inverse rule-based algorithms. The inverse rule-based algorithms have considered the problem in the presence of functional dependencies. However, there are few papers that consider the influences of functional dependencies from the point of view of the bucket-based algorithms. In this paper, we discuss this issue in the bucket-based framework. We mainly consider how to use conditions weaker than the ones in the previous algorithms when forming a set of buckets. The novelty of our approach is that we can enforce additional constraints on the non-exported attributes in a view through functional dependencies. As a result, more valid buckets can be formed. We can then generate additional rewritings which cannot be generated by the previous algorithms. We prove that our algorithm is sound and complete, i.e., the union of the obtained rewriting is a maximally-contained rewriting relative to functional dependencies under certain assumptions. In addition, we also discuss how to construct a recursive rewriting by making use of functional dependencies.

Keywords

Functional Dependency Shared Variable Query Language Previous Algorithm Conjunctive Query 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2005

Authors and Affiliations

  • Qingyuan Bai
    • 1
  • Jun Hong
    • 2
  • Hui Wang
    • 3
  • Michael F. McTear
    • 3
  1. 1.Faculty of Mathematics and Computer ScienceFuzhou UniversityFuzhouChina
  2. 2.School of Computer ScienceQueen’s University BelfastBelfastUK
  3. 3.School of Computing and MathematicsUniversity of UlsterBelfastUK

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