When Attempting to Change the Number of Cores, Errors With: DBM-10004 - Decreasing the Number of Active Cores is not Supported

Asset ID:	1-72-2177634.1
Update Date:	2018-01-08
Keywords:

Solution Type Problem Resolution Sure

Solution 2177634.1 : When Attempting to Change the Number of Cores, Errors With: DBM-10004 - Decreasing the Number of Active Cores is not Supported

Applies to:

Exadata X3-2 Hardware - Version All Versions to All Versions [Release All Releases]
Exadata X4-2 Hardware - Version All Versions to All Versions [Release All Releases]
Exadata X5-2 Hardware - Version All Versions to All Versions [Release All Releases]
Exadata X6-2 Hardware - Version All Versions to All Versions [Release All Releases]
Exadata Database Machine V2 - Version All Versions to All Versions [Release All Releases]
Information in this document applies to any platform.

Symptoms

Error DBM-10004 is seen when attempting to decrease the CPU core count on an Exadata Database Machine. May also occur when attempting to increase the core count.

Cause

System was initially configured via OEDA with wrong core count. After configuration in this manner, changing the core count may fail.

Solution

1. Start DBMCLI.

2. Use the following to force the pending core count to the desired value:

DBMCLI> ALTER DBSERVER pendingCoreCount = 14 force

3. Next, verify the pending core count. It should return 14.

DBMCLI> LIST DBSERVER attributes pendingCoreCount

4. Restart the server.

5. Verify the number of active physical cores using the following command:

DBMCLI> LIST DBSERVER attributes coreCount

If the cores are now at the desired number, this issue is resolved.

If the cores are still not at the desired number OR you continue to received the DBM-10004 error OR you receive any errors accomplishing the above steps then open an SR with Oracle Support.

NOTE: It is not possible to set the core count below the minimum number required for the system. Using the force option to try to force a core count below that number will not work. See the Oracle Exadata Database Machine Maintenance Guide for a list of the minimum and maximum cores required for the various Exadata systems. Also, refer to the Exadata Database Machine Licensing Information guide for details on core counts and licensing requirements.

References

https://docs.oracle.com/cd/E50790_01/doc/doc.121/e51951/app_error.htm

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