The prefix string used to identify Replication Agent system objects specific to one Replication Agent instance.
When Replication Agent generates system objects in the primary database, it uses the value of the ra_admin_instance_prefix parameter as an object name prefix.
Replication Agent uses the value of the ra_admin_instance_prefix parameter to recognize its system objects in the primary database. Therefore, if you change the value of the ra_admin_instance_prefix parameter after the system objects are created, Replication Agent will not be able to find its objects.
The value of the ra_admin_instance_prefix parameter specifies the non-alphabetic characters that can be used in the prefix string.
Each Replication Agent instance in a Replication Agent group must be configured with its own unique value for ra_admin_instance_prefix.