Adding the Global Role Administrator to an Existing Role

Add the global role administrator to an existing role.

Prerequisites
Administrative privilege over the role.
Task
You can grant the global role administrator to a role with administrative rights only (WITH ADMIN ONLY option).
To reinstate the global role administrator on a role, execute:
GRANT ROLE role_name TO SYS_MANAGE_ROLES_ROLE 
WITH ADMIN ONLY OPTION
Related reference
GRANT ROLE Statement