如果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，下面為大家介紹下恢復原理
如果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。原理很簡單，存儲過程的定義就是數據字典，修改數據字典跟修改普通表的數據沒有區別，此時會把修改前的內容放到undo中，我們可以根據這一點來進行閃回，所以我說要盡快，要不然找不回來了。下面我們來做一個實驗：
1.在用戶TEST下14:31下建立存儲過程
代碼如下:
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
代碼如下:
drop procedure GG_TEST;
3.登錄到sys賬戶下
復制代碼 代碼如下:
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;
