如果你不小心覆蓋了之前的存儲(chǔ)過(guò)程，那得趕緊閃回，時(shí)長(zhǎng)越長(zhǎng)閃回的可能性越小，下面為大家介紹下恢復(fù)原理

如果你不小心覆蓋了之前的存儲(chǔ)過(guò)程，那得趕緊閃回，時(shí)長(zhǎng)越長(zhǎng)閃回的可能性越小。原理很簡(jiǎn)單，存儲(chǔ)過(guò)程的定義就是數(shù)據(jù)字典，修改數(shù)據(jù)字典跟修改普通表的數(shù)據(jù)沒(méi)有區(qū)別，此時(shí)會(huì)把修改前的內(nèi)容放到undo中，我們可以根據(jù)這一點(diǎn)來(lái)進(jìn)行閃回，所以我說(shuō)要盡快，要不然找不回來(lái)了。下面我們來(lái)做一個(gè)實(shí)驗(yàn)：

1.在用戶TEST下14:31下建立存儲(chǔ)過(guò)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(chǔ)過(guò)程

代碼如下:

drop procedure GG_TEST;

3.登錄到sys賬戶下

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;

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