This paper investigates the idea of supporting metadata querying and restructuring using extensions of the SQL:1999 facilities for integrity constraints and active databases. Our approach involves associating meta-functionality with federation relations by means of constraints, assertions, and triggers. This approach can underpin recent work on dynamic interoperability in relational federations...

In temporal databases there are situations where multiple values of the same data item have overlapping validity times. In addition to the common case of multi-valued properties, there are several possible semantics to multiple values with overlapping validity times of the same data item. We refer to such data items as having simultaneous values. This paper presents a polynomial algorithm for e...

Many AI applications populate their knowledge-bases with information retrieved from large. shared databases. This paper describes a new approach to maintaining consistency between objects in a dynamic, shared database and copies of those objects which are cached in an application knowledge-base. The approach relies on an intelligent interface to active databases that we call a Mediator for Appr...

This paper focuses on dimensions characterizing the execution of global ECA rules within multi-database systems (MDBS). The MDBS speci cities that a ect rule execution are identi ed and integrated in the dimensions currently used to characterize the active rule behavior. As a result, we propose a rule execution taxonomy for global rules. It is composed of dimensions structured in three levels t...

In several working environments, production involves repeated executions of certain procedures. A workflow describes the individual tasks performed in these procedures and their interrelationships. Current Workflow Management Systems (WFMSs) use a Database Management System (DBMS) to store task descriptions, and implement all workflow functionality in modules that run on top of the DBMS. Motiva...

Current needs of industry required the development of advanced database models like mobile databases, active databases, and fuzzy databases. Fuzzy concepts are adapted to the eld of databases in order to deal with ambiguous, uncertain data. Fuzziness comes into picture in mobile databases especially with moving objects. Incorporating fuzziness into rules would improve the eeectiveness of active...

Business Re-engineering requires frequent changes in the enterprises’ information systems, however the current technology of data dictionaries is not effective for the tracing of required changes and their management. In this paper we introduce an architecture of change management using active temporal repositories. Flexible change management allows the support of information about past or futu...

At the conceptual level, business rules are formulated from an external observation perspective according to the event-condition-action structure of rules in active database systems. Business rules express how an external observer could monitor calendar time and the database state to recognize prede ned situations and to react to them accordingly. Modeling such business rules requires concepts ...

Active Database Management Systems (active DBMS) support the definition, management and execution of Event/Condition/Action-rules specifying reactive application behavior. Although the advantages of active mechanisms are nowadays well-known, there is still no wide use in practice. One main problem is that especially for large rule sets, defined by different persons at different points in time, ...

We present the compilation of a new database active faults in Slovenia, aiming at introducing geological data for first time as input national seismic hazard model. The area junction Alps, Dinarides, and Pannonian Basin is moderately seismically active. About dozen M w > 5.5 earthquakes have occurred across territory last millennium, four which instrumental era. relative paucity major lo...