如何查看oracle用戶具有的權限和角色

 1.查看所有用戶：
  select * from dba_users;
  select * from all_users;
  select * from user_users;

2.查看用戶或角色系統權限(直接賦值給用戶或角色的系統權限)：
  select * from dba_sys_privs;
  select * from user_sys_privs;
 
3.查看角色(只能查看登陸用戶擁有的角色)所包含的權限
sql>select * from role_sys_privs;

4.查看用戶對象權限：
  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.查看用戶或角色所擁有的角色：
  select * from dba_role_privs;
  select * from user_role_privs;
 
7.查看哪些用戶有sysdba或sysoper系統權限(查詢時需要相應權限)
select * from V$PWFILE_USERS
 
比如我要查看用戶 wzsb的擁有的權限：
SQL> select * from dba_sys_privs where grantee='WZSB';
 
GRANTEE                        PRIVILEGE                                ADMIN_OPTION
------------------------------ ---------------------------------------- ------------
WZSB                           CREATE TRIGGER                           NO
WZSB                           UNLIMITED TABLESPACE                     NO

比如我要查看用戶 wzsb的擁有的角色：
SQL> select * from dba_role_privs where grantee='WZSB';
 
GRANTEE   GRANTED_ROLE   ADMIN_OPTION  DEFAULT_ROLE
------------------------------ ------------------------------ ------------ ------------
WZSB                           DBA                         NO              YES

查看一個用戶所有的權限及角色
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' );