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Design and implementation of a semantic query optimizer

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2 Author(s)
Shenoy, S.T. ; Dept. of Comput. Eng. & Sci., Case Western Reserve Univ., Cleveland, OH, USA ; Ozsoyoglu, Z.M.

The authors describe a scheme to utilize semantic knowledge in optimizing a user-specified query. The semantics is represented as function-free clauses in predicate logic. The scheme uses a graph-theoretic approach to identify redundant joins and restrictions present in a given query while adding additional profitable specifications to it. Dynamic and heuristic interaction of three entities-schema, semantics, and query-forms the basis of the algorithm. The implementation architecture of the algorithm and test results on a representative set of data are presented. Issues associated with updating of semantic constraints are addressed, and an algorithm for semantic maintenance is introduced

Published in:

Knowledge and Data Engineering, IEEE Transactions on  (Volume:1 ,  Issue: 3 )

Date of Publication:

Sep 1989

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