Design Wizards and Visual Programming Environments for GenVoca Generators
IEEE Transactions on Software Engineering
Design Wizards and Visual Programming Environments for Generators
ICSR '98 Proceedings of the 5th International Conference on Software Reuse
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We present an overview and initial performance assessment of a rule-based query optimizer written in Venus, a general purpose rule language embedded in C++. Venus introduces a declarative form of structured rule programming that relates directly to nested transaction models. Venus includes a component for specifying the physical schema of its internal data structures'' and the equivalent of a query optimizer for optimizing the evaluation of the rule''s antecedents with respect to the schema. To date, development of rule-based query optimizers have included the definition and implementation of custom rule languages motivated by syntactic limitations and anticipated performance problems had a general purpose rule languages been used. Our experience demonstrates that a rule-based query optimizer can be well structured using Venus and that the optimizing compiler yields code that performs competitively with specialized systems. Since we did not have to develop a specialized rule language or consider application specific programming constructs, the source code for the optimizer is relatively quite small and straight-forward.