update了所有用户的密码，如何恢复？

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-- update了所有用户的密码，如何恢复？
select * from sys_user_copy u where u.loginname = 'lili' ;
select * from sys_user u where u.loginname = 'fujian' ;

update sys_user u set u.password = '2C216B1BA5E33A27EB6D3DF7DE7F8C36' ;
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----解决方法----------------------------------------
-- 1. 首先创建一个Copy表 sys_user_copy 与sys_user同样表结构
-- 2. 闪回，将指定时间点的表恢复到：sys_user_copy
declare
cursor flash_recover is
    select * from sys_user;
t_recode sys_user%rowtype;
begin
DBMS_FLASHBACK.ENABLE_AT_TIME(to_date('2012-05-11 18:20:05', 'yyyy-mm-dd hh24:mi:ss'));
open FLASH_RECOVER;
DBMS_FLASHBACK.DISABLE;
loop
    FETCH FLASH_RECOVER
      INTO t_recode;
    EXIT WHEN FLASH_RECOVER%NOTFOUND;
    insert into sys_user_copy values t_recode;
end loop;
CLOSE FLASH_RECOVER;
commit;
end;
/