These triggers are defined on system-level. The triggers are fired at system-level events, such as logon, logoff, startup, and DDL, which are explained as follows:

•  Database startup triggers —Refer to the triggers that are fired at database startup. These can be used to automate certain action that you want to perform every time at startup.
•  Logon triggers —Refer to the triggers that are fired at logon. You can use these TRIGGER to generate AUDIT information related to logon.
•  Logoff triggers —Refer to the triggers that are fired at logoff time. You can include certain session closure related activities in these triggers.
•  Server error triggers —Refer to the triggers that are fired at server error. These triggers can be used to log error details and send email NOTIFICATION.
•  DDL triggers --Refer to the triggers that are fired at DDL operations and can be used to audit DDL CHANGES.

These triggers are defined on system-level. The triggers are fired at system-level events, such as logon, logoff, startup, and DDL, which are explained as follows: