查看oracle用户权限

oracle中查看用户权限
1.查看所有用户：

select*fromdba_users;
 select*fromall_users;
 select*fromuser_users;

select * from dba_users;
select * from all_users;
select * from user_users;

2.查看用户或角色系统权限：

select*fromdba_sys_privs;
 select*fromuser_sys_privs;

select * from dba_sys_privs;
select * from user_sys_privs;

3.查看用户对象权限：

select*fromdba_tab_privs;
 select*fromall_tab_privs;
 select*fromuser_tab_privs;

select * from dba_tab_privs;
select * from all_tab_privs;
select * from user_tab_privs;

4.查看所有角色：

select*fromdba_roles;

select * from dba_roles;

5.查看用户或角色所拥有的角色：

select*fromdba_role_privs;
 select*fromuser_role_privs;

select * from dba_role_privs;
select * from user_role_privs;

注意：

1、以下语句可以查看Oracle提供的系统权限

select name from sys.system_privilege_map

2、查看一个用户的所有系统权限(包含角色的系统权限)

Sql代码
select privilege from dba_sys_privs where grantee='DATAUSER'
union
select privilege from dba_sys_privs where grantee in (select granted_role from dba_role_privs where grantee='DATAUSER' );

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dba查看所有用户的权限使用什么sql命令？
只知道查询当前用户权限的命令，现在要在dba用户下查看所有用户的权限，使用什么sql命令啊？

select grantee,owner,table_name,privilege from dba_tab_privs