This article describes a visualization tool that helps application developers in understanding/debugging the execution of event-based applications. Vizar allows applications to record and then replay executions of event-based systems. It is a general purpose visualization service. It is not intended or linked in any way to any speciic system { eventhough it was rst targeted for active databases...

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This paper reviews research on the formal speciication of active behaviour, indicating both what has been done in this area, and how. The scope of diierent approaches is compared within a common framework, which reveals that although many aspects of active behaviour have been described formally, no single proposal covers all phenomena associated with active database systems.

Cet article pr esente notre approche pour la construction de mod eles d'ex ecution de r egles pour bases de donn ees actives. Il introduit un cadre a la fois informel et formel pour la conception et le d eveloppement de moteurs d'ex ecution de r egles adapt es a des utilisations particuli eres des r egles dans les applications (par exemple pour la v eriication de contraintes, le calcul de valeu...

Interest has increased recently in synthesizing solutions to CIS problems by using results from the database and distributed AI communities. Such synthesis is not without its diicul-ties; results do not always transfer seamlessly to a new, complex domain. In this paper we highlight the diiculties encountered in our attempts to use event detection and subscription mechanisms (proposed in current...

In the last few years, rules as a new focus in systems analysis have been of increasing interest. One reason for this are recent developments in active database research which have resulted in first commercially available database management systems with active components. To support this rule-based active mechanisms, it is desirable that rules can be taken into account on the conceptual level....

The workload of an active DBMS consists of two types of activities: externally generated tasks submitted by users, and rule management tasks caused by the triggering of rules stored in the knowledge component of the system. Most design proposals for active DBMS’s assume that an external task should be combined with all the resulting rule management tasks into a single transaction. There is no c...