A parallel hash-based join algorithm for a networked cluster of multiprocessor nodes

  • Authors:
  • Yun Jiang;Akifumi Makinouchi

  • Affiliations:
  • -;-

  • Venue:
  • COMPSAC '97 Proceedings of the 21st International Computer Software and Applications Conference
  • Year:
  • 1997

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Abstract

Hash joins are expensive and important operations in relational database systems. Developing parallel hash join algorithms is known as an efficient method to improve their performance. Since a parallel processing environment of a networked cluster of nodes is widely available for its advantages of low-cost, high speed and ease of use, we developed a parallel hash-based join algorithm in a networked cluster of multiprocessor nodes. The parallel hash-based join algorithm has two features. One is that it takes advantage of parallel and distributed environments in which shared-memory multiprocessor computers are nodes of a networked cluster. The other is that a distributed shared virtual space is integrated into the design of the parallel hash-based join algorithm so as to facilitate the algorithm and its implementation. In this paper, we present the ideas of design, describe the parallel hash-based join algorithm, show the performance evaluation of it, as well as give a dynamic changing message model for the presence of skew.