Like DDL triggers, Event Notifications can fire on database or server-level DDL operations. However, Event Notifications...
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also has the capability of firing on trace events. For instance, an Event Notification can be created that will fire any time a deadlock event occurs. This capability offers a lot of flexibility for capturing server events, which was only possible via traces previously.
Also similar to DDL triggers, Event Notifications uses the EVENTDATA function for programmatic access to information about the event that fired the notification.
Event Notifications can be used instead of DDL triggers whenever asynchronous activities make more sense than transaction control. For instance, if you need to log a certain event, but do not need the ability to roll back the transaction if something isn't correct, Event Notifications are probably a better choice.
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