How to Solve resmgr:cpu quantum ( resource_manager_cpu_allocation ) Wait Event in Oracle 12c

You can see resmgr:cpu quantum ( resource_manager_cpu_allocation ) wait event in Performance page of Oracle Enterprise Manager Cloud Control 13c.

resmgr:cpu quantum ( resource_manager_cpu_allocation ) Wait Event

When I take AWR ( Automatic Workload Repository ) report, I saw that There are resmgr:cpu quantum Wait Event in AWR.

resource_manager_cpu_allocation

To solve this problem, I have changed resource_manager_plan and cpu_count parameters like following.

SQL> show parameter resource

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
resource_limit boolean TRUE
resource_manager_cpu_allocation integer 56
resource_manager_plan string SCHEDULER[0x444D]:DEFAULT_MAIN
TENANCE_PLAN
SQL>


SQL> alter system set resource_manager_plan='' scope=both sid='*';

System altered.

SQL>
SQL>
SQL> show parameter resource

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
resource_limit boolean TRUE
resource_manager_cpu_allocation integer 56
resource_manager_plan string
SQL>
SQL>

SQL> show parameter cpu

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
cpu_count integer 8
parallel_threads_per_cpu integer 2
resource_manager_cpu_allocation integer 56
SQL>
SQL>


SQL> alter system set cpu_count=32 scope=both sid='*';

System altered.

SQL> show parameter cpu

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
cpu_count integer 32
parallel_threads_per_cpu integer 2
resource_manager_cpu_allocation integer 56
SQL>
SQL>

cpu_count parameter

I have increased cpu_count parameters from 8 to 32 then Scheduler and  resmgr:cpu quantum Wait Event are disappeared.

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