How To Fix UJA_EXCEPTION366 - Cannot get read lock for &1 after waiting for &2 seconds

SAP Error Message - Details

• Message type: E = Error

• Message class: UJA_EXCEPTION - BPC: Admin exception message class

• Message number: 366

• Message text: Cannot get read lock for &1 after waiting for &2 seconds

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message UJA_EXCEPTION366 - Cannot get read lock for &1 after waiting for &2 seconds ?

  The SAP error message UJA_EXCEPTION366 indicates that the system is unable to obtain a read lock for a specific object after waiting for a specified amount of time. This typically occurs in scenarios where multiple processes are trying to access the same resource concurrently, leading to contention for locks.
  Cause:
  
  Lock Contention: Another process is holding a lock on the object you are trying to access, preventing your process from obtaining a read lock.
  Long-Running Transactions: A transaction that takes too long to complete can hold locks longer than expected, causing other transactions to wait.
  Deadlocks: In some cases, a deadlock situation may arise where two or more processes are waiting for each other to release locks.
  System Performance Issues: High system load or performance issues can exacerbate locking problems, leading to longer wait times.
  
  Solution:
  
  
  Identify the Lock Holder:
  
  Use transaction SM12 to check for existing locks. You can see which user or process is holding the lock on the object.
  If you identify a long-running transaction, you may need to investigate why it is taking so long.
  
  
  
  Terminate Long-Running Transactions:
  
  If a transaction is holding a lock for an extended period and is not critical, you may consider terminating it using transaction SM37 (for job monitoring) or SM50 (for process monitoring).
  
  
  
  Increase Wait Time:
  
  If the lock contention is expected and cannot be resolved immediately, consider increasing the wait time for locks in the system configuration. However, this is more of a workaround than a solution.
  
  
  
  Optimize Transactions:
  
  Review and optimize the transactions that are causing lock contention. This may involve breaking down large transactions into smaller ones or improving the performance of the code.
  
  
  
  Monitor System Performance:
  
  Regularly monitor system performance and locking behavior to identify patterns that may lead to locking issues. Tools like ST03N (Workload Analysis) can help analyze performance.
  
  
  
  Consult SAP Notes:
  
  Check for any relevant SAP Notes that may address specific issues related to locking and performance in your version of SAP.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM12: Display and manage locks.
  SM50: Monitor active processes.
  SM37: Monitor background jobs.
  ST03N: Analyze workload and performance.
  
  
  
  SAP Documentation: Refer to SAP Help Portal for detailed documentation on locking mechanisms and performance tuning.
  
  
  SAP Community: Engage with the SAP Community forums for insights and solutions from other users who may have encountered similar issues.
  
  
  By following these steps, you should be able to diagnose and resolve the locking issue causing the UJA_EXCEPTION366 error.