oracle怎么恢复被覆盖的存储过程

在oracle数据库中，如果覆盖了之前的存储过程，那得赶紧闪回，时长越长闪回的可能性越小。

原理很简单，存储过程的定义就是数据字典，修改数据字典跟修改普通表的数据没有区别，此时会把修改前的内容放到undo中，可以根据这一点来进行闪回，所以我说要尽快，要不然找不回来了。

来做一个实验：

1.在用户TEST下14:31下建立存储过程

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.在用户TEST下在14:33下删除存储过程 

drop procedure GG_TEST;

3.登录到sys账户下 

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;
--- www.jbxue.com
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;