How To Fix CU012 - General locking error

SAP Error Message - Details

• Message type: E = Error

• Message class: CU - Variants / configuration messages

• Message number: 012

• Message text: General locking error

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CU012 - General locking error ?

  The SAP error message CU012, which indicates a "General locking error," typically occurs when there is an issue with the locking mechanism in the SAP system. This can happen in various scenarios, such as when multiple users or processes attempt to access or modify the same data simultaneously, leading to a conflict.
  Causes of CU012 General Locking Error:
  
  Concurrent Access: Multiple users or processes trying to access or modify the same object or data at the same time.
  Long-Running Transactions: A transaction that takes too long to complete may hold locks longer than expected, causing other transactions to fail.
  Database Lock Table Full: The database lock table may be full, preventing new locks from being created.
  Inconsistent Lock Management: Issues with the way locks are managed in the application or database.
  Network Issues: Temporary network issues that disrupt communication between the application and the database.
  
  Solutions to CU012 General Locking Error:
  
  
  Identify Locking Issues:
  
  Use transaction codes like SM12 (Display and Delete Locks) to check for existing locks. You can identify which user or process is holding the lock.
  Use SM21 (System Log) to check for any related error messages or logs that might provide more context.
  
  
  
  Release Locks:
  
  If you identify a lock that is no longer needed, you can manually delete it using transaction SM12. Be cautious when doing this, as it may affect other users.
  
  
  
  Optimize Transactions:
  
  Review and optimize long-running transactions to ensure they complete in a timely manner. This may involve breaking down large transactions into smaller, more manageable ones.
  
  
  
  Increase Lock Table Size:
  
  If the lock table is frequently full, consider increasing its size. This can be done by adjusting the database parameters, but it may require assistance from your database administrator.
  
  
  
  Check for Deadlocks:
  
  Investigate if there are any deadlocks occurring in the system. Deadlocks can cause locking issues and may require specific handling in your application logic.
  
  
  
  Review Application Logic:
  
  Ensure that the application logic is designed to handle locking appropriately, including proper error handling and retry mechanisms.
  
  
  
  Consult SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that may address specific issues related to the CU012 error.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM12: Display and Delete Locks
  SM21: System Log
  SM37: Job Monitoring (to check for background jobs that may be causing locks)
  
  
  
  SAP Documentation: Refer to SAP Help documentation for more details on locking mechanisms and best practices.
  
  
  Performance Monitoring: Regularly monitor system performance and locking behavior to proactively address potential issues.
  
  
  If the problem persists after trying the above solutions, it may be necessary to involve your SAP Basis team or SAP support for further investigation.