On Harmonically Combining Active, Object-Oriented, and Deductive Databases

Although there are a number of issues to resolve, active databases, object-oriented databases, and deductive databases can be smoothly integrated. We present the integration challenges, provide a resolution to the issues, and show a way to achieve this integration by describing the active, objectoriented, and deductive features of a model/language called Harmony. Harmony lets us see the integration issues in a different light, because it provides an alternative way of modeling an application. It thus lets us give an alternate solution for smoothly combining event-condition-action rules, object orientation, and logic, that better supports the development of advanced applications. 1 Introduction Over the past decade, there has been growing interest in combining object-oriented languages, logic languages, and active event-condition-action processing with database systems. Progress has been made on several fronts. Several object-oriented database systems have become commercially availabl..