记录一下，备查：

1.查看所有用户：

select * from dba_users;

select * from all_users;

select * from user_users;

2.查看用户或角色系统权限(直接赋值给用户或角色的系统权限)：

select * from dba_sys_privs;

select * from user_sys_privs;

3.查看角色(只能查看登陆用户拥有的角色)所包含的权限

sql>select * from role_sys_privs;

4.查看用户对象权限：

select * from dba_tab_privs;

select * from all_tab_privs;

select * from user_tab_privs;

5.查看所有角色：

select * from dba_roles;

6.查看用户或角色所拥有的角色：

select * from dba_role_privs;

select * from user_role_privs;

7.查看哪些用户有sysdba或sysoper系统权限(查询时需要相应权限)

select * from V$PWFILE_USERS

比如我要查看用户 wzsb的拥有的权限：

SQL> select * from dba_sys_privs where grantee='WZSB';

GRANTEE PRIVILEGE ADMIN_OPTION

------------------------------ ---------------------------------------- ------------

WZSB CREATE TRIGGER NO

WZSB UNLIMITED TABLESPACE NO

比如我要查看用户 wzsb的拥有的角色：

SQL> select * from dba_role_privs where grantee='WZSB';

GRANTEE GRANTED_ROLE ADMIN_OPTION DEFAULT_ROLE

------------------------------ ------------------------------ ------------ ------------

WZSB DBA NO YES

查看一个用户所有的权限及角色

select privilege from dba_sys_privs where grantee='WZSB'

union

select privilege from dba_sys_privs where grantee in

(select granted_role from dba_role_privs where grantee='WZSB' );