Users having dba role in Oracle database

SQL> desc dba_role_privs
Name         Null?    Type
------------ -------- ------------
GRANTEE               VARCHAR2(30)
GRANTED_ROLE NOT NULL VARCHAR2(30)
ADMIN_OPTION          VARCHAR2(3)
DEFAULT_ROLE          VARCHAR2(3)

select * from dba_role_privs where granted_role='DBA';

 GRANTEE   GRANTED_ROLE ADM DEF
--------- ------------ --- ---
SYS       DBA          YES YES
SYSTEM    DBA          YES YES