How To Fix CMMD084 - Error when setting a lock

SAP Error Message - Details

• Message type: E = Error

• Message class: CMMD -

• Message number: 084

• Message text: Error when setting a lock

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 CMMD084 - Error when setting a lock ?

  The SAP error message CMMD084 indicates that there is an issue with setting a lock in the system. This error typically arises in scenarios where multiple processes or users are trying to access or modify the same data simultaneously, leading to a conflict in locking mechanisms.
  Cause:
  
  Concurrent Access: The most common cause of this error is that another user or process has already locked the object you are trying to access. This can happen in environments with high concurrency.
  Lock Table Overflow: If the lock table is full, new locks cannot be set, leading to this error.
  System Configuration Issues: Misconfigurations in the SAP system or issues with the underlying database can also lead to locking problems.
  Long-Running Transactions: If a transaction takes too long to complete, it may hold locks longer than necessary, causing other transactions to fail when trying to acquire the same locks.
  
  Solution:
  
  Check Lock Entries: Use transaction code SM12 to check for existing lock entries. You can identify if another user or process is holding the lock and take appropriate action (e.g., wait for the lock to be released or contact the user).
  Increase Lock Table Size: If the lock table is full, consider increasing its size. This can be done by adjusting the parameters in the SAP profile (e.g., enque/table_size).
  Optimize Transactions: Review and optimize long-running transactions to ensure they do not hold locks longer than necessary. This may involve breaking down large transactions into smaller ones or improving performance.
  System Monitoring: Regularly monitor the system for lock contention issues and address any underlying performance problems that may be causing excessive locking.
  Restart the Application: In some cases, restarting the application or the SAP instance may help clear stale locks.
  
  Related Information:
  
  Transaction Codes:
  
  SM12: Display and manage lock entries.
  SM21: Check system logs for any related errors or warnings.
  ST22: Analyze dumps that may provide insights into the issue.
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to locking mechanisms.
  Documentation: Review SAP documentation on lock management and concurrency control for best practices.
  
  If the problem persists after trying the above solutions, it may be necessary to involve your SAP Basis team or consult SAP support for further assistance.