Complex applications in domains such as decision support systems and real time systems require a functionality that is achieved by combining the active and temporal database technologies. In this paper we present TALE, a Temporal Active Language and Execution model. TALE is a temporal active database programming language, combined with an execution model that enables a correct and eecient proce...

Active databases are usually centered around the notion of Event-Condition-Action (ECA) rules. An ECA rule’s action is executed upon detection of an event whenever the rule’s condition is true. Events are traditionally described using an event algebra. Virtually every proposed active database management system (ADBMS) brings about a different event algebra. This makes it very difficult to analy...

Triggers are the basic ingredient of active databases. Ode triggers are event-action pairs. An event can be a composite event (i.e., an event composed from other events). Composite events are detected by translating the event speciications into nite state machines. In this paper, we describe the integration and implementation of composite event based triggers into the Ode object database. We fo...

Recent approaches to integrity enforcement in active databases suggest not only to check constraint violations by triggers but also to utilize triggers to perform inconsistency repair actions. However, for sophisticated reactions these approaches often require refinements of already derived integrity maintaining and inconsistency repairing triggers. We argue that analyzing and specifying reacti...

These two rule-oriented paradigms of databases have been the focus of extensive research and are now coming of age in the commercial DBMS world. However, the systems developed so far support well only one of the two paradigms— thus limiting the effectiveness of such systems in many applications that require complete integration of both kinds of rules. In this paper, we discuss the technical pro...

The Ode object-oriented database provides facilities for associating constraints and triggers with objects.Constraints and triggers are associated with class (object type) definitions which makes them easy to read,to implement, and to blend with object inheritance. In this paper, we state our design goals in providingtrigger and constraint facilities for an object-oriented database,...

These two rule-oriented paradigms of databases have been the focus of extensive research and are now coming of age in the commercial DBMS world. However, the systems developed so far support well only one of the two paradigms|thus limiting the eeectiveness of such systems in many applications that require complete integration of both kinds of rules. In this paper, we discuss the technical probl...

ECA (event/condition/action) rules have been developed for central active database systems. In distributed active database systems the problem of inaccessibility of partial systems raises and thus the undecidability of ECA conditions referring to remote systems. This work proposes an enhancement of ECA rules for distributed active database systems to react also in the case of inaccessibility an...

Abstract We present the Malawi Active Fault Database (MAFD), an open‐access ( https://doi.org/10.5281/zenodo.5507190 ) geospatial database of 113 fault traces in and neighboring Tanzania Mozambique. is located within East African Rift's (EAR) Western Branch where active identification challenging because chronostratigraphic data are rare, and/or faults buried so do not have a surface expression...