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A symmetric fragment and replicate algorithm for distributed joins

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2 Author(s)
Stamos, J.W. ; Almaden Res. Center, IBM Corp., San Jose, CA, USA ; Young, H.C.

It is shown that the fragment and replicate (FR) distributed join algorithm is a special case of the symmetric fragment and replicate (SFR) algorithm, which improves the FR algorithm by reducing its communication. The SFR algorithm, like the FR algorithm, is applicable to N-way joins and nonequijoins and does tuple balancing automatically. The authors derive formulae that show how to minimize the communication in the SFR algorithm, discuss its performance on a parallel database prototype, and evaluate its practicality under various conditions. It is claimed that SFR improves the worst-case cost for a distributed join, but it will not displace specialized distributed join algorithms when the later are applicable

Published in:

Parallel and Distributed Systems, IEEE Transactions on  (Volume:4 ,  Issue: 12 )

Date of Publication:

Dec 1993

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