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;