How To Fix NSDM_MIG_CONTROL042 - Aggregate (complete) migration cannot be locked

SAP Error Message - Details

• Message type: E = Error

• Message class: NSDM_MIG_CONTROL - Log message for migration

• Message number: 042

• Message text: Aggregate (complete) migration cannot be locked

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

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Smart SAP Assistant

• What is the cause and solution for SAP error message NSDM_MIG_CONTROL042 - Aggregate (complete) migration cannot be locked ?

  The SAP error message NSDM_MIG_CONTROL042 indicates that the system is unable to lock the aggregate migration process, which is necessary for the complete migration of data. This error typically arises during the data migration process in SAP systems, particularly when using the Data Migration Cockpit or similar tools.
  Causes:
  
  Concurrent Processes: Another migration process or transaction might be running simultaneously, which prevents the system from acquiring the necessary lock.
  Lock Table Issues: The lock table might be full or experiencing issues, leading to the inability to set a lock for the migration process.
  System Configuration: There may be configuration issues or settings that prevent the locking mechanism from functioning correctly.
  Database Issues: Problems with the underlying database, such as deadlocks or other locking issues, can also lead to this error.
  
  Solutions:
  
  
  Check for Concurrent Processes:
  
  Verify if there are any other migration processes running. If so, wait for them to complete before starting the migration again.
  Use transaction codes like SM12 to check for existing locks and SM21 to review system logs for any related issues.
  
  
  
  Clear Lock Entries:
  
  If you find unnecessary locks, you can delete them using transaction SM12. However, be cautious and ensure that you are not disrupting other users or processes.
  
  
  
  Increase Lock Table Size:
  
  If the lock table is full, consider increasing its size. This can be done by adjusting the parameters in the database configuration.
  
  
  
  Review System Configuration:
  
  Check the configuration settings related to data migration and locking mechanisms. Ensure that they are set correctly according to SAP best practices.
  
  
  
  Database Health Check:
  
  Perform a health check on the database to identify any underlying issues that may be causing locking problems. This may involve checking for deadlocks or other performance issues.
  
  
  
  Restart the Migration Process:
  
  After addressing the above issues, try restarting the migration process to see if the error persists.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to the specific error message for any patches or updates that may address the issue.
  Documentation: Review the official SAP documentation for the Data Migration Cockpit or the specific migration tool you are using for any additional troubleshooting steps.
  Support: If the issue persists after trying the above solutions, consider reaching out to SAP Support for further assistance.
  
  By following these steps, you should be able to diagnose and resolve the NSDM_MIG_CONTROL042 error effectively.