How to get the error message which causes Synonym Invalid?

Question

Hi,
I created a synonym in USER_B for a table in USER_A.
I have given all priveleges to USER_B from USER_A.
I created a package. In that I am using this synonym. Its working fine.
Today I have seen that.. the synonym is showing as invalid.
Even I recompiled the synonym. But its still showing as Invalid in PL/SQL developer.
Here I would like to see the error message which cause the synonym invalid.
How can I see the error message.?
Thank you,
Regards,
Gowtham Sen.

Answer 1

Makes perfect sense. Oracle automatically attempts to revalidate objects when you try to use them.
SQL> create table t (
  2  col1 NUMBER);
SQL> create or replace procedure p is
  2   x POSITIVE;
  3  begin
  4    SELECT COUNT(*)
  5    INTO x
  6    FROM t;
  7  end p;
  8  /
Procedure created.
SQL> drop table t purge;
Table dropped.
SQL> select status
  2  from user_objects
  3  where object_name = 'P';
STATUS
INVALID
SQL> create table t (
  2  col1 NUMBER);
Table created.
SQL> select status
  2  from user_objects
  3  where object_name = 'P';
STATUS
INVALID
SQL> exec p
BEGIN p; END;
ERROR at line 1:
ORA-06502: PL/SQL: numeric or value error
ORA-06512: at "UWCLASS.P", line 4
ORA-06512: at line 1
SQL> select status
  2  from user_objects
  3  where object_name = 'P';
STATUS
VALID
SQL> Even when the procedure has a problem ... the revalidation takes place.