engleski

A Coloured Petri Net Model for Active Databases

An active database management system (ADBMS) is a conventional database system capable of reacting to some events which can occur inside or outside of the database. The basic concept of an ADBMS is the concept of active rules. When certain events occur and some conditions are fulfilled an active rule is triggered. Another topic to be considered is Coloured Petri nets. Petri nets are considered as a graphical and mathematical modelling tool. They are a tool for describing and analysing information systems that are characterized as being concurrent, asynchronous, distributed, parallel, and nondeterministic. Petri nets can be used as visual-communication tools and tokens are used in these nets to simulate the dynamic and concurrent activities of systems. Active databases and Petri nets rely upon similar paradigms and concepts so they can be treated as complementary technologies. Since not much work has been carried out in defining and combining them together, this paper proposes a Petri net model to represent knowledge and the behaviour of an active database environment, which integrates active rules with database objects.

active database, coloured Petri nets, rules, events

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