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Multiple dependent queries execution using critical path scheduling in parallel databases

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3 Author(s)
Liu, K.H. ; Dept. of Comput. & Math. Sci., Victoria Univ. of Technol., Melbourne, Vic., Australia ; Leung, C.H.C. ; Jiang, Y.

Multiple processors are employed to improve the performance of database systems and the parallelism can be exploited at three levels in query processing: intra-operation, inter-operation, and inter-query parallelism. Intra-operation and inter-operation parallelism are also called intra-query parallelism which has been studied extensively. In contrast, inter-query parallelism has received little attention particularly for multiple dependent queries. We develop a decompression algorithm, CPS, for coping with multiple dependent queries which are represented by a directed graph, and the algorithm makes use of the activity analysis of critical path analysis, and the resource scheduling and levelling of project management. A simulation study has been conducted and the results show that the proposed algorithm outperforms other existing methods and is able to provide a global optimal solution when the number of processors available is sufficient

Published in:

Algorithms and Architectures for Parallel Processing, 1997. ICAPP 97., 1997 3rd International Conference on

Date of Conference:

10-12 Dec 1997

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