1.查看所有用户：
select * from dba_user;
select * from all_users;
select * from user_users;
2.查看用户系统权限：
select * from dba_sys_privs;
select * from all_sys_privs;
select * from user_sys_privs;
3.查看用户对象权限：
select * from dba_tab_privs;
select * from all_tab_privs;
select * from user_tab_privs;
4.查看所有角色：
select * from dba_roles;
5.查看用户所拥有的角色：
select * from dba_role_privs;
select * from user_role_privs;
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