CPU used under Resource Manager.

Question

Hi,
in 10g R2, I have created a Plan for DBMS resource manager :
EXEC DBMS_RESOURCE_MANAGER.CREATE_PENDING_AREA();
EXEC DBMS_RESOURCE_MANAGER.CREATE_SIMPLE_PLAN(SIMPLE_PLAN => 'simple_plan1',CONSUMER_GROUP1 => 'mygroup1', GROUP1_CPU => 80,CONSUMER_GROUP2 => 'mygroup2', GROUP2_CPU => 20);
ALTER SYSTEM SET RESOURCE_MANAGER_PLAN ='simple_plan1';
EXEC DBMS_RESOURCE_MANAGER.SWITCH_CONSUMER_GROUP_FOR_USER ('SCOTT', 'MYGROUP2');
EXEC DBMS_RESOURCE_MANAGER_PRIVS.GRANT_SWITCH_CONSUMER_GROUP ('SCOTT', 'MYGROUP2', TRUE);
EXEC DBMS_RESOURCE_MANAGER.SUBMIT_PENDING_AREA;
EXEC DBMS_RESOURCE_MANAGER.CLEAR_PENDING_AREA;Now SCOTT runs the following ( exemple from 24 Using the Database Resource Manager) :
DECLARE
m NUMBER;
BEGIN
FOR i IN 1..100000 LOOP
FOR j IN 1..100000 LOOP
* The following query does a cartesian product without
* a predicate and takes up significant CPU time.
select count(*) into m from v$sysstat, v$system_event;
END LOOP;
END LOOP;
END;
END;
/And CPU comsumption goes up to 100%. Why ? According to his consummer group shouldn't he just have 20% of CPU ?
Any explanation ?
Thank you.

Answer 1

Thanks to all.
Ok, we will run the same script by SYS to have CPU load to 100%. Then SCOTT will run that script. How much CPU will he have ? And where can I see it ?
And of course , SCOTT is just waiting :
SQL> SELECT se.sid sess_id, co.name consumer_group,
  2   se.state, se.consumed_cpu_time cpu_time, se.cpu_wait_time, se.queued_time
  3   FROM v$rsrc_session_info se, v$rsrc_consumer_group co
  4   WHERE se.current_consumer_group_id = co.id
  5  and sid=137;
   SESS_ID CONSUMER_GROUP                   STATE
  CPU_TIME CPU_WAIT_TIME QUEUED_TIME
       137 MYGROUP2                         WAITING FOR CPU
   3473688     130618354           0I created another user for MYGROUP1 and he runs the same script, now both are waiting :
SQL> SELECT se.sid sess_id, co.name consumer_group,
  2   se.state FROM v$rsrc_session_info se, v$rsrc_consumer_group co
  3   WHERE se.current_consumer_group_id = co.id
  4  and sid=108;
   SESS_ID CONSUMER_GROUP                   STATE
       108 MYGROUP1                         WAITING FOR CPU
SQL> SELECT se.sid sess_id, co.name consumer_group,
  2   se.state FROM v$rsrc_session_info se, v$rsrc_consumer_group co
  3   WHERE se.current_consumer_group_id = co.id
  4  and sid=137;
   SESS_ID CONSUMER_GROUP                   STATE
       137 MYGROUP2                         WAITING FOR CPU