Communicating control knowledge to a deductive database system

  • Authors:
  • Helmut Schmidt

  • Affiliations:
  • Reifersbrunner Straβe 26, 8905 Mering, Germany

  • Venue:
  • CSC '92 Proceedings of the 1992 ACM annual conference on Communications
  • Year:
  • 1992

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Abstract

In relational or deductive database systems the user can hardly (or only in a rather implicit way) change the deduction process used for answering a query. For example, the user cannot specify that–for a given query–some rules of a deductive database are irrelevant for computing the answer of that query and hence should be disregarded, or that–while computing the answer of a query–some tuples should be preferred over other tuples. In [Sch91] we have introduced a deductive database system which offers the user a framework for specifying such control knowledge. Thereby the user can adapt the deduction process of our deductive database system to the application at hand. In this paper we will briefly recapture the architecture of this system. Then we will present two examples, and we will show how these two examples can be solved more efficiently with our system.