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Efficient algorithms for the instantiated transitive closure queries

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3 Author(s)
Qadah, G.Z. ; Dept. of Electr. Eng. & Comput. Sci., Northwestern Univ., Evanston, IL, USA ; Henschen, L.J. ; Kim, J.J.

The performances of several algorithms suitable for processing an important class of recursive queries called the instantiated transitive closure (TC) queries are studied and compared. These algorithms are the wavefront, δ-wavefront, and a generic algorithm called super-TC. During the evaluation of a TC query, the first two algorithms may read a given disk page more than once, whereas super-TC reads the disk page at most once. A comprehensive performance evaluation of these three algorithms using rigorous analytical and simulation models is presented. The study reveals that the relative performance of the algorithms is a strong function of the parameters which characterize the processed TC query and the relation referenced by that query. The superiority of one of the super-TC variants over all of the other presented algorithms is shown

Published in:

Software Engineering, IEEE Transactions on  (Volume:17 ,  Issue: 3 )

Date of Publication:

Mar 1991

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