How To Fix DB6518 - An invalid value has been returned for the DFT_MON_LOCK switch

SAP Error Message - Details

• Message type: E = Error

• Message class: DB6 - DB6: Alert Monitoring and Alert Configuration

• Message number: 518

• Message text: An invalid value has been returned for the DFT_MON_LOCK switch

Copy of DB6 515

What causes this issue?

To allow meaningful monitoring of the database, you must activate this
switch.

System Response

If this switch is not set, it can lead to problems ranging from
restricting the function of the CCMS transactions to erroneous
terminations.

How to fix this error?

Activate the switch by setting the appropriate database manager
parameters using the following command:
<LB>UPDATE DBM CFG USING DFT_MON_LOCK ON </>
The setting will become active at the next connection to the database.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DB6518 - An invalid value has been returned for the DFT_MON_LOCK switch ?

  The SAP error message DB6518, which states "An invalid value has been returned for the DFT_MON_LOCK switch," typically relates to issues with the database monitoring settings in the SAP system. This error can occur in various scenarios, particularly when there are inconsistencies or misconfigurations in the database settings.
  Cause:
  
  Invalid Configuration: The DFT_MON_LOCK switch is expected to have a specific value (usually a boolean value indicating whether monitoring is enabled or disabled). If the value returned is not valid (e.g., NULL, unexpected string, etc.), this error can occur.
  Database Issues: There may be underlying issues with the database itself, such as corruption or misconfiguration that affects how settings are read or interpreted.
  SAP Kernel or Database Version Mismatch: If there is a mismatch between the SAP kernel version and the database version, it can lead to unexpected behavior, including this error.
  Transport Issues: If recent changes or transports have been made to the system, they may have inadvertently affected the configuration of the DFT_MON_LOCK switch.
  
  Solution:
  
  Check Configuration: Verify the configuration settings for the DFT_MON_LOCK switch in the database. Ensure that it is set to a valid value (typically 0 for off and 1 for on).
  Database Consistency Check: Run consistency checks on the database to identify and resolve any underlying issues. This may involve using database-specific tools or commands.
  Update SAP Kernel: Ensure that you are using a compatible version of the SAP kernel for your database. If necessary, update the kernel to the latest version.
  Review Recent Changes: If the error started occurring after a recent change or transport, review those changes to identify any potential misconfigurations.
  Consult Documentation: Refer to the SAP Notes and documentation related to your specific database and SAP version for any known issues or patches that may address this error.
  Contact SAP Support: If the issue persists after trying the above solutions, consider reaching out to SAP support for further assistance. They may provide specific guidance based on your system configuration and version.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to DB6518 for any specific patches or updates that may address this issue.
  Database Documentation: Review the documentation for your specific database (e.g., HANA, Oracle, SQL Server) for any relevant configuration settings or troubleshooting steps.
  System Logs: Analyze system logs (transaction SM21) for any additional error messages or warnings that may provide more context about the issue.
  
  By following these steps, you should be able to diagnose and resolve the DB6518 error in your SAP system.