How to get the CPU time of a query?

Question

Hello all, will someone pls tell me how to get the CPU time instead of Elapsed Time of a query?
Thanks.

Answer 1

If i am not wrong, Jonathan Lewis blogged about the changed behaviour.
Here is short test:
SQL> CREATE OR REPLACE FUNCTION Cpu RETURN NUMBER IS
  2    Retval NUMBER;
  3  BEGIN
  4    SELECT m.VALUE
  5    INTO      Retval
  6    FROM      V$statname s, V$mystat m
  7    WHERE  s.Statistic# = m.Statistic#
  8    AND       NAME = 'CPU used by this session';
  9    RETURN Retval;
10  END;
11  /
Function created.
cat cpu_test.sql
DECLARE
TYPE t IS TABLE OF NUMBER;
tt t;
BEGIN
dbms_output.put_line(cpu());
SELECT COUNT(*) over(PARTITION BY owner) BULK COLLECT INTO tt FROM all_objects;
dbms_output.put_line(cpu());
SELECT COUNT(*) over(PARTITION BY object_type) BULK COLLECT INTO tt FROM user_objects;
dbms_output.put_line(cpu());
SELECT COUNT(*) over(PARTITION BY owner) BULK COLLECT INTO tt FROM dba_objects;
dbms_output.put_line(cpu());
END;
SQL> select * from v$version
  2  /
BANNER
Oracle9i Enterprise Edition Release 9.2.0.6.0 - Production
PL/SQL Release 9.2.0.6.0 - Production
CORE    9.2.0.6.0       Production
TNS for Linux: Version 9.2.0.6.0 - Production
NLSRTL Version 9.2.0.6.0 - Production
SQL> @cpu_test
0
0
0
0
PL/SQL procedure successfully completed.
SQL> @cpu_test
106
106
106
106
PL/SQL procedure successfully completed.
SQL> select * from v$version
  2  /
BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - Prod
PL/SQL Release 10.2.0.3.0 - Production
CORE    10.2.0.3.0      Production
TNS for Linux: Version 10.2.0.3.0 - Production
NLSRTL Version 10.2.0.3.0 - Production
SQL> set serveroutput on
SQL> @cpu_test
1
129
130
145
PL/SQL procedure successfully completed.
SQL> @cpu_test
145
273
275
290
PL/SQL procedure successfully completed.Best regards
Maxim