Trigger Defaults

The Trigger Defaults tab displays the default settings for triggers in a database associated with a DB Alias.

db alias editor, trigger defaults tab, explained below

Select default options used to provide the identifier for new triggers. You can create a new trigger based on the following:

Object
Identifier from a corresponding target object. For triggers, the corresponding target object is the table referenced in the trigger.
Source
Identifier from the source trigger.
Current ID
Current database user ID from the destination.
Explicit
New identifier. If you select this option, you must specify an identifier.