How To Fix 00650 - Semaphore operation failed, session terminated

SAP Error Message - Details

• Message type: E = Error

• Message class: 00 -

• Message number: 650

• Message text: Semaphore operation failed, session terminated

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.

Unfortunately, there isn't any extra information in this error notice.

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Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

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Smart SAP Assistant

• What is the cause and solution for SAP error message 00650 - Semaphore operation failed, session terminated ?

  The SAP error message "00650 Semaphore operation failed, session terminated" typically indicates a problem with the SAP system's ability to manage its internal processes, particularly related to semaphore operations. Semaphores are synchronization mechanisms used to control access to shared resources in a concurrent system, and issues with them can lead to session terminations.
  Causes:
  
  Resource Limitations: The system may be running out of resources, such as memory or process limits, which can prevent semaphore operations from completing successfully.
  Configuration Issues: Incorrect configuration settings in the SAP system or the underlying operating system can lead to semaphore failures.
  Operating System Issues: Problems with the operating system, such as kernel parameters not being set correctly, can affect semaphore operations.
  Database Issues: If the database is experiencing issues, it may impact the SAP application and lead to semaphore errors.
  Network Problems: Network interruptions or issues can also cause session terminations.
  
  Solutions:
  
  Check System Resources: Monitor the system's memory and CPU usage. Ensure that there are enough resources available for the SAP system to operate smoothly.
  Review Configuration Settings: Verify the configuration settings for semaphores in the SAP system and the operating system. Ensure that they are set according to SAP's recommendations.
  Adjust Kernel Parameters: If you are on a Unix/Linux system, check and adjust kernel parameters related to semaphores (e.g., SEM, SHM, etc.) in the /etc/sysctl.conf file or using the sysctl command.
  Restart SAP Services: Sometimes, simply restarting the SAP services can resolve temporary issues related to semaphore operations.
  Check Database Health: Ensure that the database is functioning correctly and that there are no locks or performance issues.
  Review Logs: Check the SAP system logs (transaction SM21) and the operating system logs for any additional error messages or warnings that could provide more context about the issue.
  Consult SAP Notes: Look for relevant SAP Notes in the SAP Support Portal that may address this specific error message or provide additional troubleshooting steps.
  
  Related Information:
  
  SAP Support: If the issue persists, consider reaching out to SAP Support for assistance. They can provide more detailed guidance based on the specific version of SAP you are using.
  Documentation: Review the official SAP documentation for your version to understand the recommended configurations and best practices for managing semaphores and system resources.
  Community Forums: Engage with SAP community forums or user groups where other users may have encountered similar issues and can share their solutions.
  
  By following these steps, you should be able to diagnose and resolve the "00650 Semaphore operation failed, session terminated" error in your SAP system.