一、查看所有用户
SELECT * FROM DBA_USERS; SELECT * FROM ALL_USERS; SELECT * FROM USER_USERS;
二、查看用户系统权限
SELECT * FROM DBA_SYS_PRIVS; SELECT * FROM USER_SYS_PRIVS;
三、查看用户对象或角色权限
SELECT * FROM DBA_TAB_PRIVS; SELECT * FROM ALL_TAB_PRIVS; SELECT * FROM USER_TAB_PRIVS;
四、查看所有角色
SELECT * FROM DBA_ROLES;
五、查看用户或角色所拥有的角色
SELECT * FROM DBA_ROLE_PRIVS; SELECT * FROM USER_ROLE_PRIVS;