SQL> @v

Version Oracle : 10.2.0.3.0

SQL> alter session set  Optimizer_mode=rule;

Session altered.

SQL> explain plan for select * from t;

Explained.

SQL> select * from table(dbms_xplan.display);
PLAN_TABLE_OUTPUT
--------------------------------------------------------------------------
Plan hash value: 1601196873

----------------------------------
| Id  | Operation         | Name |
----------------------------------
|   0 | SELECT STATEMENT  |      |
|   1 |  TABLE ACCESS FULL| T    |
----------------------------------

Note
-----
   - rule based optimizer used (consider using cbo)

12 rows selected.