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The Computer Journal 1990 33(1):49-60; doi:10.1093/comjnl/33.1.49
© 1990 by British Computer Society
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Logical Optimisation of Distributed Knowledge Base Queries

M. C. Taylor *

Department of Computer Science, University of Houston, Texas, USA

Query optimisation is a crucial element in providing acceptable performance in a distributed knowledge base system. This paper considers optimisation in a heterogeneous environment where each node provides an interface to a common model. The common model is object-oriented, using unnormalised relations with an extended relational algebra as query language. Both the data structures and the language are formally defined using the Vienna Development Method (VDM). These formal definitions are then used as a basis for deriving conditions under which various optimising transformations can be applied.

Received November 1988. revised July 1989.

* Present address: Department of Computer Science, University of Houston, Texas, USA.

§ Department of Computer Science, University of Keele, Keele, Staffs.


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