Columns last_ddl_time and timestamp in dba_objects

Question

Hi,
i just ran into strange thing.
i created a procedure called aaa. then i ran create or replace procedure aaa with the same code of the original procedure.
i was surprised to see that the fields of last_ddl_time and timestamp haven't change.
Of course, when i did this experiment with changing one line in the original package - the fields of last_ddl_time and timestamp did change.
The question is if it's suppose to be this way and if so, is there any way to make this fields change even if the "new" code is exectly the same.
thanks

Answer 1

Hi,
i demonstrated the thing here.
i forgot to mention that the DB version i'm using is 11.2.0.3.
SQL> select last_ddl_time,timestamp from dba_objects where object_name = 'AAAAAAA';
no rows selected
SQL> create or replace procedure AAAAAAA is
begin
null;
end; 2 3 4
5 /
Procedure created.
SQL> select last_ddl_time,timestamp from dba_objects where object_name = 'AAAAAAA';
LAST_DDL_TIME TIMESTAMP
17-APR-2013 17:37:09 2013-04-17:17:37:09
SQL> create or replace procedure AAAAAAA is
begin
null;
end; 2 3 4
5 /
Procedure created.
SQL> select last_ddl_time,timestamp from dba_objects where object_name = 'AAAAAAA';
LAST_DDL_TIME TIMESTAMP
17-APR-2013 17:37:09 2013-04-17:17:37:09
SQL> create or replace procedure AAAAAAA is
begin
null;
null;
end; 2 3 4 5
6 /
Procedure created.
SQL> select last_ddl_time,timestamp from dba_objects where object_name = 'AAAAAAA';
LAST_DDL_TIME TIMESTAMP
17-APR-2013 17:38:02 2013-04-17:17:38:02