In this paper, we propose a method for integrity enforcement in relational databases with view de nition using the production rule mechanism provided by active database systems. The method generates a set of trigger rules at compile-time. This set of rules can repair at run-time the inconsistency produced by some transactions by executing a simple update over the extensional database. We also p...

Active databases have been promoted as a viable way to solve the problems of many nontraditional database applications. While there are several proposals for mechanisms to support active database features, analysis and design have been largely ignored. As a remedy, we propose Object-oriented Systems Modeling (OSM) for active database analysis and design. OSM, which is not an extension or retrof...

Current activities in the Database Technology Research Group at the University of Zurich explore object-oriented and active database management systems as well as architectural issues of DBMS in general. The overall driving force behind our efforts is to better support new and demanding application areas like e.g. CIM or scientific data processing. This paper gives a motivation and brief overvi...

Misuse Detection systems identify evidence of attacks by searching for patterns of known attacks (signatures). A main problem in this context is the modeling and specification of attack signatures. A couple of languages are proposed in the literature, which differ in the aspects of signatures that can be described. Some aspects that can be specified in one language cannot be expressed in anothe...

EEcient activation of rules is a fundamental issue in active database systems; choosing the suitable rule activation technique is therefore an important task. We have developed a technique, called join pattern indexing, to support incremental update of rule-derived data. In this paper, we compare join pattern indexing with discrimination networks (Rete and TREAT) for data-derivation rules. A pe...