oracle恢復被覆蓋的存儲過程

    假設你不小心覆蓋了之前的存儲過程，那得趕緊閃回，時長越長閃回的可能性越小。原理非常easy，存儲過程的定義就是數據字典，改動數據字典跟改動普通表的數據沒有差別，此時會把改動前的內容放到undo中，我們能夠依據這一點來進行閃回，所以我說要盡快，要不然找不回來了。以下我們來做一個實驗：

1.在用戶TEST下14:31下建立存儲過程

create or replace procedure GG_TEST
as l_cnt number;
begin
for i in 1 .. 10000
  loop
    execute immediate 'select count(*) from t where x = ' || i into l_cnt;
  end loop;

end;

2.在用戶TEST下在14:33下刪除存儲過程
drop procedure GG_TEST;

3.登錄到sys賬戶下
create table p_temp  as  
    select *
      from dba_source as of timestamp TO_TIMESTAMP('2014-05-04 14:33:00', 'YYYY-MM-DD HH24:MI:SS')
     where TYPE = 'PROCEDURE'
       And owner = 'TEST'
       And Name = 'GG_TEST';


select text
  from p_temp
 where name like upper('%GG_TEST%')
   and owner = 'TEST'

 order by line;

TEXT
---------------------------------------------------------------------------
procedure GG_TEST
as l_cnt number;
begin
for i in 1 .. 10000
  loop
    execute immediate 'select count(*) from t where x = ' || i into l_cnt;
  end loop;
end;