How To Fix KM800 - System error: No further entries possible in the lock table

SAP Error Message - Details

• Message type: E = Error

• Message class: KM - Error messages for Profit Center Accounting

• Message number: 800

• Message text: System error: No further entries possible in the lock table

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message KM800 - System error: No further entries possible in the lock table ?

  The SAP error message KM800, which states "System error: No further entries possible in the lock table," typically indicates that the lock table in the SAP system has reached its maximum capacity. This can prevent further entries from being made, leading to issues with data processing and transaction handling.
  Cause:
  
  Lock Table Capacity: The lock table has a predefined limit on the number of entries it can hold. When this limit is reached, no new locks can be created, resulting in the KM800 error.
  Long-Running Transactions: If there are long-running transactions that hold locks for an extended period, they can contribute to filling up the lock table.
  High Concurrency: A high number of concurrent users or processes trying to access the same data can lead to an increased number of locks being created.
  Configuration Issues: The configuration settings for the lock table may not be optimized for the current usage patterns of the system.
  
  Solution:
  
  
  Increase Lock Table Size:
  
  You can increase the size of the lock table by adjusting the parameter enque/table_size in the SAP system profile. This requires access to the system configuration and may need a restart of the SAP instance.
  To do this, go to transaction RZ10, select the appropriate profile, and modify the parameter. After making changes, restart the instance for the changes to take effect.
  
  
  
  Monitor and Optimize Transactions:
  
  Identify long-running transactions that may be holding locks unnecessarily. You can use transaction SM12 to view and manage locks.
  Encourage users to complete transactions promptly and avoid holding locks longer than necessary.
  
  
  
  Review Lock Management:
  
  Regularly monitor the lock table usage and analyze patterns to understand peak usage times.
  Consider implementing strategies to reduce lock contention, such as optimizing database access patterns or using more granular locking mechanisms.
  
  
  
  System Performance Tuning:
  
  Review overall system performance and consider tuning other parameters that may affect lock management and concurrency.
  
  
  
  Consult SAP Notes:
  
  Check for any relevant SAP Notes that may provide additional guidance or patches related to lock table management and the KM800 error.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM12: To view and manage locks.
  RZ10: To change instance profile parameters.
  SM21: To check system logs for related errors.
  
  
  
  SAP Documentation: Refer to SAP Help Portal for detailed documentation on lock management and performance tuning.
  
  
  SAP Community: Engage with the SAP Community forums for insights and shared experiences from other users who may have encountered similar issues.
  
  
  By following these steps, you should be able to resolve the KM800 error and improve the overall lock management in your SAP system.