oracle如何恢复被覆盖的存储过程

create or replace procedure GG_TEST
as l_t number;
begin
for i in 1 .. 10000
loop
execute immediate 'select count() from t where x = ' || i into l_t;
end loop;

end;

drop procedure GG_TEST;

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_t number;
begin
for i in 1 .. 10000
loop
execute immediate 'select count() from t where x = ' || i into l_t;
end loop;
end;