|
SQL>
SQL> select * from dual;
D
-
X
SQL> select * from DUAL;
D
-
X
SQL>
SQL> select sql_text, hash_value from v$sql where upper(sql_text) = 'SELECT * FROM DUAL';
SQL_TEXT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
HASH_VALUE
----------
select * from DUAL
3649189949
select * from dual
942515969
SQL_TEXT
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
HASH_VALUE
----------
select * from dual
942515969
3 rows selected.
SQL>
SQL> alter session set OPTIMIZER_MODE = first_rows;
Session altered.
SQL>
SQL> select * from dual;
D
-
X
|