How To Fix ICM529 - Maximum Number of HTTP UFO Cache Entries

SAP Error Message - Details

• Message type: E = Error

• Message class: ICM - Messages for ICM Monitor

• Message number: 529

• Message text: Maximum Number of HTTP UFO Cache Entries

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 ICM529 - Maximum Number of HTTP UFO Cache Entries ?

  The SAP error message ICM529: Maximum Number of HTTP UFO Cache Entries typically occurs in the Internet Communication Manager (ICM) when the number of entries in the UFO (Universal File Object) cache exceeds the configured limit. This can lead to performance issues or the inability to serve HTTP requests efficiently.
  Cause:
  
  Cache Limit Exceeded: The default maximum number of entries in the UFO cache is reached. This can happen if there are many unique requests for files or resources that are not being cached effectively.
  Configuration Settings: The settings for the UFO cache may not be optimized for the workload or usage patterns of your application.
  High Traffic: An increase in traffic or requests for unique resources can lead to rapid filling of the cache.
  
  Solution:
  
  
  Increase the Cache Size:
  
  You can increase the maximum number of UFO cache entries by adjusting the profile parameters in the SAP system. The relevant parameter is icm/HTTP/UFO/MaxEntries.
  To change this parameter, follow these steps:
  
  Go to transaction RZ10 (Profile Maintenance).
  Select the appropriate instance profile.
  Add or modify the parameter icm/HTTP/UFO/MaxEntries to a higher value (e.g., 10000 or more, depending on your needs).
  Save the changes and restart the ICM or the entire SAP system for the changes to take effect.
  
  
  
  
  
  Monitor Cache Usage:
  
  Use transaction SMICM to monitor the ICM and check the current cache usage. This can help you understand if the cache size is appropriate for your workload.
  
  
  
  Optimize Resource Requests:
  
  Review the types of resources being requested. If there are many unique requests for files that do not change often, consider optimizing how these resources are served (e.g., using static content delivery, CDN, etc.).
  
  
  
  Regular Maintenance:
  
  Implement regular maintenance tasks to clear the cache if necessary, especially if the application has a lot of dynamic content that changes frequently.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or updates regarding this error.
  ICM Documentation: Review the official SAP documentation for the Internet Communication Manager for best practices on caching and performance tuning.
  Performance Monitoring: Use tools like SAP Solution Manager or other monitoring tools to keep an eye on system performance and cache hit ratios.
  
  By following these steps, you should be able to resolve the ICM529 error and improve the performance of your SAP system's HTTP handling.