Abstract

We present a model for deductive databases which contain query-driven (or passive) and update-driven (or active) rules. Our approach is based on the assumptions that (a) both inserted and deleted facts are explicitly stored in the database and used in the derivation process and (b) update-driven rules override query-driven derivations. We give formal semantics for such databases using a least fixpoint computation in the context of a three-valued logic. Our objective is to contribute to the foundations of a general theory for so-called intelligent or active databases.

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