How To Fix SA321 - Global lock table is full

SAP Error Message - Details

• Message type: E = Error

• Message class: SA -

• Message number: 321

• Message text: Global lock table is full

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.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message SA321 - Global lock table is full ?

  The SAP error message SA321, which states "Global lock table is full," indicates that the global lock table in the SAP system has reached its maximum capacity. This can lead to issues with data consistency and can prevent users from obtaining necessary locks for transactions.
  Cause:
  
  High Lock Demand: The system is experiencing a high number of lock requests, which can occur during peak usage times or due to specific transactions that require many locks.
  Long-Running Transactions: Transactions that hold locks for an extended period can contribute to the lock table becoming full.
  Configuration Limits: The configuration settings for the global lock table may be set too low for the current workload.
  Lock Leaks: If transactions are not properly releasing locks (due to errors or programming issues), this can lead to an accumulation of locks.
  
  Solution:
  
  
  Increase Lock Table Size:
  
  You can increase the size of the global lock table by adjusting the profile parameters in the SAP system. The relevant parameter is enque/table_size. You can do this by:
  
  Accessing the SAP system with appropriate administrative rights.
  Using transaction RZ10 to modify the instance profile.
  Increasing the value of enque/table_size and saving the changes.
  Restarting the SAP instance for the changes to take effect.
  
  
  
  
  
  Monitor and Optimize Transactions:
  
  Identify long-running transactions and optimize them to reduce the time locks are held.
  Review the code for any potential lock leaks and ensure that locks are released properly after their use.
  
  
  
  Lock Monitoring:
  
  Use transaction SM12 to monitor and analyze locks. This can help identify which users or processes are holding locks and for how long.
  You can also use transaction SM21 to check the system log for any related errors or warnings.
  
  
  
  Regular Maintenance:
  
  Implement regular maintenance and monitoring of the system to ensure that lock usage is within acceptable limits.
  Consider scheduling batch jobs during off-peak hours to reduce lock contention.
  
  
  
  Consult SAP Notes:
  
  Check for any relevant SAP Notes that may provide additional guidance or patches related to lock management.
  
  
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for detailed information on lock management and configuration.
  SAP Community: Engage with the SAP Community forums for insights and experiences from other users who may have faced similar issues.
  Performance Tuning: Consider performance tuning of the SAP system to ensure efficient resource utilization and minimize lock contention.
  
  By addressing the underlying causes and implementing the suggested solutions, you can mitigate the occurrence of the SA321 error and improve the overall performance of your SAP system.