Which trigger action when condition occurs?

The triggered action condition is an optional clause of the triggered action which specifies a search condition that must evaluate to true to run statements within the triggered action. If the WHEN clause is omitted, then the statements within the triggered action are always executed.

What is an ECA rule?

An event-condition-action rule (ECA rule) is the method underlying event-driven computing, in which actions are triggered by events, given the existence of specific conditions. Events with significance to the system are identified within an event-driven program.

What is the event condition action rule used in active database?

PDL “uses the event–condition–action (ECA) rule paradigm of active databases to define a policy as a function that maps a series of events into a set of actions.” This approach is interesting because in addition to policy rules, there are policy-defined event propositions that allow groups of simple events to trigger …

What is ECA in active database?

Event condition action (ECA) is a short-cut for referring to the structure of active rules in event driven architecture and active database systems. Such a rule traditionally consisted of three parts: The event part specifies the signal that triggers the invocation of the rule.

What are the after triggers?

Explanation: The triggers run after an insert, update or delete on a table. They are not supported for views. Explanation: AFTER TRIGGERS can be classified further into three types as: AFTER INSERT Trigger, AFTER UPDATE Trigger, AFTER DELETE Trigger.

What is Rule Manager?

Rules Manager manages the primitive events and joins them together before evaluating the rules.

What is trigger explain with example?

A trigger is a block of code that is executed automatically from a database statement. Triggers is generally executed for DML statements such as INSERT, UPDATE or DELETE. It is used to mention the execution time of the trigger. It specifies whether the trigger should fire after or before the DML statement.

What are the two types of trigger?

What are the types of triggers?

• DDL Trigger.
• DML Trigger.
• Logon Trigger.

What is the meaning of event condition action?

Event condition action ( ECA) is a short-cut for referring to the structure of active rules in event driven architecture and active database systems. Such a rule traditionally consisted of three parts:

Which is an example of an event triggering a trigger?

1. Event: a) The rules are triggered by Event. b) These events can be database insert, update or delete statements. c) Changing an employee’s manager can be an event on which trigger can be fired. 2.

How is an action part of an ECA rule triggered?

As a consequence, the execution of the action part of an active rule can match the event part of the same or another active rule, thus triggering it. The equivalent in a memory-based rule engine would be to invoke an external method that caused an external event to trigger another ECA rule.