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Other comments on 'Optimization algorithms for distributed queries' by P.M.G. Apears

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3 Author(s)
Cellary, W. ; Inst. of Control Eng., Tech. Univ. of Poznan, Poland ; Krolikowski, Z. ; Morzy, T.

An erroneous fact concerning the assumption of irreducibility of nonjoining attributes of the distributed query optimization algorithm called GENERAL presented in the above paper (see ibid., vol.SE-9, no.1, p.57-68, Jan. 1983) is pointed out. It is shown that it is possible to generate an efficient semijoin program with better response time than the one produced by the GENERAL algorithm. A counterexample that proves this possibility is provided.

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Software Engineering, IEEE Transactions on  (Volume:14 ,  Issue: 4 )