How To Fix UJF_EXCEPTION028 - Maximum number of open files exceeded

SAP Error Message - Details

• Message type: E = Error

• Message class: UJF_EXCEPTION - BPC: File Service Message Class

• Message number: 028

• Message text: Maximum number of open files exceeded

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 UJF_EXCEPTION028 - Maximum number of open files exceeded ?

  The SAP error message UJF_EXCEPTION028: Maximum number of open files exceeded typically indicates that the system has reached the limit of file descriptors that can be opened simultaneously. This can occur in various environments, including SAP systems running on Unix/Linux or Windows servers.
  Causes:
  
  File Descriptor Limit: Each operating system has a limit on the number of file descriptors that can be opened by a single process or by the system as a whole. If your SAP application is trying to open more files than this limit, you will encounter this error.
  Resource Leaks: If the application is not properly closing file handles after use, it can lead to resource leaks, eventually exhausting the available file descriptors.
  High Load: A sudden increase in load or concurrent users can lead to more files being opened than usual, hitting the limit.
  Configuration Issues: The system may be configured with a low limit for file descriptors, which may not be sufficient for the workload.
  
  Solutions:
  
  
  Increase File Descriptor Limit:
  
  On Linux/Unix:
  
  Check the current limit using the command: ulimit -n
  To increase the limit temporarily, you can use: ulimit -n <new_limit> (replace <new_limit> with the desired number).
  For a permanent change, you may need to edit /etc/security/limits.conf and add or modify entries for the user running the SAP application.
  
  
  On Windows:
  
  Windows does not have a direct equivalent to file descriptors, but you can check for system resource limits and adjust them as necessary.
  
  
  
  
  
  Check for Resource Leaks:
  
  Review the application code to ensure that all file handles are being closed properly after use.
  Use monitoring tools to identify any processes that are consuming an excessive number of file descriptors.
  
  
  
  Optimize Application Usage:
  
  If possible, optimize the application to reduce the number of files opened simultaneously. This may involve batching operations or reusing file handles.
  
  
  
  Monitor System Resources:
  
  Use system monitoring tools to keep an eye on file descriptor usage and system load. This can help you identify patterns that lead to the error.
  
  
  
  Consult SAP Notes:
  
  Check the SAP Support Portal for any relevant notes or patches that may address this issue. There may be specific recommendations or fixes provided by SAP.
  
  
  
  Related Information:
  
  Operating System Documentation: Refer to the documentation for your specific operating system for details on managing file descriptors and system limits.
  SAP Documentation: Review SAP's official documentation for best practices regarding system performance and resource management.
  System Logs: Check the SAP system logs and operating system logs for additional context around the error, which may help in diagnosing the root cause.
  
  By addressing the file descriptor limits and ensuring proper resource management, you can resolve the UJF_EXCEPTION028 error and prevent it from occurring in the future.