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Resource Manager Overthrottline with Spin in KQLMCLUSTERMESSAGEBEGIN (Doc ID 2639945.1)

Last updated on MARCH 10, 2020

Applies to:

Oracle Database - Enterprise Edition - Version 12.1.0.2 and later
Information in this document applies to any platform.

Symptoms

Customer seeing high resmgr: CPU quantum waits occasionally on production database.

The database that is having issues has below setup with respect to resource manager and their CPU_COUNT is 28 on a server with 72 CPU.

Plan Database Shares Limit                                                        Limit

-------------------------- ------------------------- ------ -----------
--------
DEFAULT_CDB_PLAN ORA$DEFAULT_PDB_DIRECTIVE 1 100
100
DEFAULT_CDB_PLAN ORA$AUTOTASK 90
100
DEFAULT_MAINTENANCE_PLAN ORA$AUTOTASK 90
100
DEFAULT_MAINTENANCE_PLAN ORA$DEFAULT_PDB_DIRECTIVE 1 100
100
ORA$INTERNAL_CDB_PLAN ORA$AUTOTASK
ORA$INTERNAL_CDB_PLAN ORA$DEFAULT_PDB_DIRECTIVE
ORA$QOS_CDB_PLAN ORA$AUTOTASK 90
100
ORA$QOS_CDB_PLAN ORA$DEFAULT_PDB_DIRECTIVE 1 100
100
TNT_CDB_PLAN PDBCCR02P 2 20
20
TNT_CDB_PLAN PDBSRE01P 2 10
10
TNT_CDB_PLAN PDBCCR01P 2 35
35
TNT_CDB_PLAN PDBSEI01P 2 10
10
TNT_CDB_PLAN PDBMRR01P 2 10
10
TNT_CDB_PLAN PDBCOG01P 2 10
10
TNT_CDB_PLAN PDBTCO01P 2 10
10
TNT_CDB_PLAN PDBNCA01P 2 10
10
TNT_CDB_PLAN PDBFCA01P 2 10
10
TNT_CDB_PLAN ORA$AUTOTASK 1 75
75
TNT_CDB_PLAN ORA$DEFAULT_PDB_DIRECTIVE 2 10
10

The PDB that is having issues is PDBXXXX1P. If we observe this PDB has 35 utilization limit with 2 shares and it can go up to 9.8 average running
sessions(35 of 28 CPU).

Changes

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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