Cannot find out the audited sys privs about a role

Question

hi guys,
SQL> select user_name from dba_priv_audit_opts
  2  where user_name='DBA';
no rows selectednot too sure why the above view would show what system privilege was being audited on the role DBA.
It seem that it can only show result when user_name is literally a username.
SQL> select privilege from dba_priv_audit_opts
  2  where user_name='TOM';
PRIVILEGE
GRANT ANY OBJECT PRIVILEGE

Answer 1

SQL>CREATE USER PRUEBA IDENTIFIED BY PRUEBA;
User created.
SQL>GRANT SELECT, UPDATE, INSERT ON HR.EMPLOYEES TO PRUEBA;
Grant succeeded.
SQL> CREATE ROLE PRUEBA_ROL;
SQL> GRANT SELECT, UPDATE, DELETE ON HR.JOBS TO PRUEBA_ROL;
Grant succeeded.
SQL> GRANT PRUEBA_ROL TO PRUEBA;
Grant succeeded.
SQL> SET ROLE PRUEBA_ROL;
Role defined.
SQL> SELECT GRANTEE, GRANTED_ROLE FROM DBA_ROLE_PRIVS WHERE GRANTEE='PRUEBA';
GRANTEE                      GRANTED_ROLE
PRUEBA                        PRUEBA_ROL
SQL> SELECT GRANTEE, OWNER, PRIVILEGE, TABLE_NAME FROM DBA_TAB_PRIVS WHERE GRANTEE='PRUEBA';
GRANTEE                        OWNER          PRIVILEGE                                TABLE_NAME
PRUEBA                         HR                UPDATE                                   EMPLOYEES
PRUEBA                         HR                SELECT                                    EMPLOYEES
PRUEBA                         HR                INSERT                                    EMPLOYEESHTH