How To Fix 00424 - Semaphore lock error

SAP Error Message - Details

• Message type: E = Error

• Message class: 00 -

• Message number: 424

• Message text: Semaphore lock error

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 00424 - Semaphore lock error ?

  The SAP error message "00424 Semaphore lock error" typically indicates that there is a problem with the semaphore locks used by the SAP system to manage concurrent access to resources. This error can occur in various scenarios, often related to issues with the underlying operating system or database.
  Causes:
  
  Resource Contention: Multiple processes may be trying to access the same resource simultaneously, leading to contention for semaphore locks.
  Insufficient System Resources: The system may not have enough semaphores available, which can happen if the limits set in the operating system are too low.
  Improper Configuration: The SAP instance may not be configured correctly, leading to issues with semaphore management.
  Database Issues: Problems with the database, such as deadlocks or other locking issues, can also manifest as semaphore lock errors.
  Operating System Limits: The operating system may have reached its limit for semaphore sets or semaphores.
  
  Solutions:
  
  
  Check Semaphore Limits: Review and, if necessary, increase the semaphore limits on the operating system. This can typically be done by modifying system parameters (e.g., in /etc/sysctl.conf for Linux systems).
  
  For example, you might need to adjust parameters like kernel.sem (which controls semaphore settings).
  
  
  
  Restart SAP Services: Sometimes, simply restarting the SAP services or the entire server can resolve temporary semaphore lock issues.
  
  
  Monitor Resource Usage: Use monitoring tools to check for processes that may be holding onto semaphores longer than necessary. Identify and resolve any long-running processes.
  
  
  Review SAP Configuration: Ensure that the SAP instance is configured correctly, particularly in relation to the number of work processes and their handling of locks.
  
  
  Database Maintenance: Perform regular maintenance on the database to ensure that it is functioning optimally and that there are no deadlocks or other locking issues.
  
  
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  
  
  Related Information:
  
  Operating System Documentation: Refer to the documentation for your specific operating system to understand how to configure semaphore settings.
  SAP Basis Administration: Knowledge of SAP Basis administration can be beneficial for troubleshooting and resolving issues related to system configuration and performance.
  SAP Community: Engaging with the SAP Community can provide insights from other users who may have encountered similar issues.
  
  If the problem persists after trying the above solutions, it may be necessary to engage SAP support for further assistance.