How To Fix CNV_DMC_HC042 - Multiple master jobs are running (&1 master jobs are running)

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_DMC_HC -

• Message number: 042

• Message text: Multiple master jobs are running (&1 master jobs are running)

What causes this issue?

There are multiple SAP Landscape Transformation Replication Server
master jobs running which should not be the case.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Multiple active master jobs active can result in issues. In transaction
SM37, search for job /1LT/IUC_REP_MSTR. You should find more than one
active entry. If not, extend the timeframe for which the search is
executed. Stop the jobs which have been running the longest until there
is only one active job.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_DMC_HC042 - Multiple master jobs are running (&1 master jobs are running) ?

  The SAP error message CNV_DMC_HC042 indicates that multiple master jobs are currently running in the Data Migration Cockpit (DMC) environment. This situation can occur when the system is trying to execute multiple instances of a master job simultaneously, which is not allowed.
  Cause:
  
  
  Concurrent Execution: The primary cause of this error is that the system has detected that more than one master job is currently active. This can happen if:
  
  A previous job has not completed yet.
  A job was accidentally started multiple times.
  There is a misconfiguration in the job scheduling.
  
  
  
  System Configuration: The system may be configured to allow only a single instance of a master job to run at any given time, and if another instance is triggered, it will raise this error.
  
  
  Solution:
  
  
  Check Running Jobs: 
  
  Go to the transaction code SM37 (Job Monitoring) in SAP.
  Check for any running jobs related to the Data Migration Cockpit. Look for jobs with the same name or related to the same migration task.
  
  
  
  Wait for Completion: If you find that a job is still running, you may need to wait for it to complete before starting a new one.
  
  
  Terminate Stuck Jobs: If a job is stuck or taking too long, you may need to terminate it. You can do this from the SM37 transaction by selecting the job and choosing the option to cancel it.
  
  
  Review Job Scheduling: Ensure that your job scheduling does not allow for multiple instances of the same job to be triggered. This may involve reviewing the job definitions and any related scheduling configurations.
  
  
  Check Logs: Review the logs of the running jobs to identify any issues that may have caused them to hang or take longer than expected.
  
  
  System Resources: Ensure that your system has adequate resources (CPU, memory, etc.) to handle the jobs being executed, as resource constraints can sometimes lead to jobs not completing in a timely manner.
  
  
  Related Information:
  
  
  Transaction Codes: 
  
  SM37: Job Monitoring
  SM21: System Log
  ST22: Dump Analysis
  SLG1: Application Log
  
  
  
  Documentation: Refer to SAP Notes and documentation related to the Data Migration Cockpit for any specific configurations or limitations regarding job execution.
  
  
  SAP Support: If the issue persists after following the above steps, consider reaching out to SAP Support for further assistance, providing them with details of the error and the steps you have already taken.
  
  
  By following these steps, you should be able to resolve the CNV_DMC_HC042 error and ensure that your data migration jobs run smoothly.