This chapter provides a predicate logic based semantics for active rules in active databases [18, 9]. Our main contribution is a proposal to integrate the specification of active rules with the specification of the dynamics of transaction based change in relational databases. Our approach extends previous work in which the situation calculus, a language of many sorted predicate logic, is used t...

The concept of triggers has been used for almost thirty years. But taking into account the fact that the active database theory kept developing during the years, it is even more and more obvious that existing database management systems do not keep the pace with the theory i.e. there is an obvious gap between the theory and the practice. The paper deals with the theory of active databases; we w...

This section describes an approach for representing and propagating contraints in active database systems during product development. In this context, constraints are used for consistency checks of product models in databases as well as for the support of designers in product development. Concepts of active database systems are examined to represent and evaluate dependencies specified by design...

This paper deals with the principles of rule-based systems in databases and gives an overview of existing approaches. First, we introduce the concept of rules. The application of rule-based systems to databases is categorized. Deductive database systems are introduced as the first extension of classical database management systems. We briefly describe the concept of deductive databases and thei...

This paper provides a predicate logic based semantics for active rules in active databases [24, 10]. Previous work has been done to provide semantics of execution of active rules [21, 3, 9, 11]. In part, this work has been directed towards providing a unifying criteria regarding the meaning of active rules, and to provide a framework for comparing different proposals for active database systems...

Panel Abstract This panel addresses a very important area that is often neglected or overlooked by database systems, database applications developers and data warehouse designers, namely storage. We propose to inform, discuss and debate the use of “Active Storage Hierarchy” in database systems and applications. By active storage hierarchy we mean a database system that uses all storage media (i...