How To Fix /STTPEC/MSG101 - No free sessions available for parallel process

SAP Error Message - Details

• Message type: E = Error

• Message class: /STTPEC/MSG -

• Message number: 101

• Message text: No free sessions available for parallel process

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 /STTPEC/MSG101 - No free sessions available for parallel process ?

  The SAP error message /STTPEC/MSG101 No free sessions available for parallel process typically indicates that the system has reached its limit for parallel processing sessions. This can occur in various scenarios, particularly when multiple processes are trying to execute simultaneously, and the system does not have enough available sessions to handle the load.
  Causes:
  
  Session Limit Reached: The maximum number of parallel sessions allowed in the SAP system has been reached. This limit can be configured in the system settings.
  Long-Running Processes: If there are long-running processes that are occupying sessions, it can lead to a shortage of available sessions for new requests.
  Configuration Issues: The configuration settings for parallel processing may not be optimized for the current workload.
  Resource Constraints: The underlying hardware or system resources may be insufficient to handle the number of parallel processes being requested.
  
  Solutions:
  
  
  Increase Session Limits:
  
  You can increase the number of allowed parallel sessions in the SAP system. This can be done by adjusting the parameters in the instance profile (e.g., rdisp/wp_no_dia for dialog work processes).
  Use transaction RZ10 to modify the instance profile parameters and then restart the instance for changes to take effect.
  
  
  
  Monitor and Optimize Processes:
  
  Use transaction SM50 or SM66 to monitor active processes and identify any long-running or stuck processes that may be holding sessions.
  Terminate any unnecessary or stuck processes to free up sessions.
  
  
  
  Review Configuration:
  
  Check the configuration settings for parallel processing in your specific application or module. Ensure that they are set appropriately for your workload.
  Consult with your Basis team to ensure that the system is configured optimally for your business needs.
  
  
  
  Batch Processing:
  
  If applicable, consider scheduling batch jobs during off-peak hours to reduce the load on the system during peak times.
  
  
  
  System Resources:
  
  Ensure that the underlying hardware resources (CPU, memory, etc.) are sufficient to handle the expected load. Upgrading hardware may be necessary if resource constraints are identified.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or solutions specific to your version of SAP.
  Documentation: Review SAP documentation related to parallel processing and session management for best practices and configuration guidelines.
  Performance Monitoring: Regularly monitor system performance and session usage to proactively manage and prevent similar issues in the future.
  
  If the problem persists after trying the above solutions, it may be beneficial to consult with SAP support or your internal SAP Basis team for further assistance.