Long wait : resmgr:cpu quantum making the qwury hang

Question

Hi Everyone,
We are on Oracle EBS : 11.5 and Oracle Database 11.2.0.2.
Since last night one of the concurrent request is running and on querying the v$sqltext , it shows that its stuck at one select query.
On further investigation using the v$session_waits table against the sid : i came accross the follow info:
SQL> select event,wait_class from v$session_wait where sid=656;
EVENT                          WAIT_CLASS
resmgr:cpu quantum             Schedulerthe current settings for the same in the database are :
SQL> show parameter resource
NAME                                 TYPE        VALUE
resource_limit                       boolean     FALSE
resource_manager_cpu_allocation      integer     56
resource_manager_plan                string      SCHEDULER[0x194DA9]:DEFAULT_MA
                                                 INTENANCE_PLANPlease provide your suggestions.
Regards
Kk

Answer 1

To reset the parameter, issue:
SQL> alter system set resource_manager_plan='' scope=spfile;
I tried in dev instance and i was unable to set it to the above value.
SQL>
alter system set resource_manager_plan='SCHEDULER[0x194DA9]:DEFAULT_MAINTENANCE_PLAN'scope=both;SQL>
alter system set resource_manager_plan='SCHEDULER[0x194DA9]:DEFAULT_MAINTENANCE_PLAN'scope=both
ERROR at line 1:
ORA-02097: parameter cannot be modified because specified value is invalid
ORA-56714: Plan name SCHEDULER[0x194DA9]:DEFAULT_MAINTENANCE_PLAN exceeds the
maximum length allowed
Try the following:
SQL> alter system set resource_manager_plan='SCHEDULER[0x194DA9]:DEFAULT_MAINTENANCE_PLAN' scope=both;
Or,
SQL> alter system set resource_manager_plan='SCHEDULER[0x194DA9]:DEFAULT_MAINTENANCE_PLAN' scope=spfile;There should be a space between the value and the scope=both/spfile.
If you use the spfile, then you need to bounce the database.
Thanks,
Hussein