Comment on How to CANCEL a query running in another session? by Mladen Gogala

I had no luck on 11.2.0.3 on Linux:
1 begin
2 dbms_resource_manager.switch_consumer_group_for_sess(
3 27,25,’CANCEL_SQL’);
4* end;
SQL> /
begin
*
ERROR at line 1:
ORA-29366: invalid CONSUMER_GROUP argument specified
ORA-06512: at “SYS.DBMS_RMIN”, line 505
ORA-06512: at “SYS.DBMS_RESOURCE_MANAGER”, line 916
ORA-06512: at line 2