Synonyms cant be recompiled when the tables are dropped and recreated?

Question

hi
i have a synonym pointing to a table .
1)when i drop and recreate a table.............
isnt it enough to recompile the synonym? do i need to drop the synonym as well and recreate again?
2) when i add new columns to a table will the synonym also show up the new column?
thanks in advance
raj

Answer 1

Recompiled is probably not quite the correct word. Re-validated is more like it.
Notice that the synonym goes invalid when the table is dropped, but does NOT become valid when the table is recreated.
That happens the first time it's used (similar to invalid stored procedures).
SQL> drop table t;
Table dropped.
SQL> select object_name, status
  2  from user_objects
  3  where object_name = 'T_SYN';
OBJECT_NAME                    STATUS
T_SYN                          INVALID
SQL> create table t(c number);
Table created.
SQL> select object_name, status
  2  from user_objects
  3  where object_name = 'T_SYN';
OBJECT_NAME                    STATUS
T_SYN                          INVALID
SQL> select * from t_syn;
no rows selected
SQL> select object_name, status
  2  from user_objects
  3  where object_name = 'T_SYN';
OBJECT_NAME                    STATUS
T_SYN                          VALID