如题，查询结果：
SQL> select name from system_privilege_map where name not in (select distinct privilege from role_sys_privs where role='DBA');
NAME
----------------------------------------
SYSOPER
EXEMPT ACCESS POLICY
EXEMPT IDENTITY POLICY
ALTER ANY OPERATOR
UNLIMITED TABLESPACE
SYSDBA
6 rows selected.
SYSOPER、SYSDBA、UNLIMITED TABLESPACE可以理解，但UNLIMITED TABLESPACE为什么不给DBA？第二个到第四个是什么权限？为什么不给呢？
