oracle用户对象的操作

1、查看所有用户
 select * from dba_users;
 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;
 6、查看当前用户的缺省表空间
 select username,default_tablespace from user_users;
 7、查看某个角色的具体权限
 如grant connect,resource,create session,create view to TEST;
 8、查看RESOURCE具有那些权限
 用SELECT * FROM DBA_SYS_PRIVS WHERE GRANTEE='RESOURCE';