Active database management system (ADBMS)

What is an Active Database Management System (ADBMS)?
An active database management system (ADBMS) is an event-driven system in which changes to the schema or data generate events that are monitored by active rules. Active database management systems are called by synchronous events generated by user or application programs, as well as by external asynchronous data change events such as a change in sensor value or time.

Active database management systems support event monitoring. You save events in the event history as an event type and time. The former represents some type of primitive event, while the latter represents the time the event occurred. ADMS clearly define rules of semantics such as event consumption policies, event detection and coupling modes along with instance or sentence oriented semantics.

A general event consumption policy contains the following parameter contexts:

- Cumulative: All instances of the primitive event are consumed when a complex event occurs.

- Chronicle: Events are consumed in chronological order.

- Last: The last instances of primitive events that are part of complex events are processed in chronological order.