Abstract

Publisher Summary This chapter describes the motivation of research in active databases, introducing several key concepts related to active databases and focusing on the problem of methodological support for this kind of database management system (DBMS) functionality. It gives an outline of active database concepts compared to traditional DBMS architectures and presents a discussion of technical questions, such as event definition languages and trigger execution models. A rationale for all the subsequent methodological considerations is given. The chapter discusses several design sub-phases in the context of information system development projects and aims at giving a justification of a specialized design formalism for the construction of active databases. It provides some background with respect to Statecharts and extended event-reaction (ER) diagrams, and introduces a new formalism—namely, entity-relationship Statechart (ERSC) monitors. An ERSC monitor resembles an event-driven device which is constructed following a predefined template, that is, an ERSC monitor type.

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