Active Database

An active database is a database with the event monitoring scheme for detecting when certain data is INSERTED, DELETED, UPDATED, or SELECTED, and automatically executing the actions in response when certain events happen and particular conditions are meet.

Application:

n  Management Information Systems

n  Concurrent Engineering

n  Business-to-Business Messaging and Workflow Coordination

n  Factory Automation

n  Network and System Management

n  Defense Applications

n  Rules provide a uniform and powerful mechanism to express:

n  Integrity constraints and their enforcement

n  Assertions about the database

n  Triggers and alerts

n  Corporate Policy Specification

n  Configuration Management Policies

n  Update semantics for shared objects with alerts  to notify of changes to relevantobjects

n  Performance monitoring for 1) load balancing, 2) query optimization, and database reorganization

n  Usage monitoring for knowledge discovery regarding user profiles and preferences.