亚洲免费不卡_在线视频精品_国产尤物精品_久久久久网址_久久精品91_欧美va天堂在线_狠狠入ady亚洲精品_亚洲午夜精品福利_国产精品草草_午夜精品久久99蜜桃的功能介绍

如果你不小心覆蓋了之前的存儲(chǔ)過程，那得趕緊閃回，時(shí)長越長閃回的可能性越小，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)過程，那得趕緊閃回，時(shí)長越長閃回的可能性越小。原理很簡單，存儲(chǔ)過程的定義就是數(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)來進(jìn)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(gè)實(shí)驗(yàn)：

1.在用戶TEST下14:31下建立存儲(chǔ)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(chǔ)過程

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;

更多信息請查看IT技術(shù)專欄