How To Fix ICM523 - Current number of HTTP server cache entries in use (in percent)

SAP Error Message - Details

• Message type: E = Error

• Message class: ICM - Messages for ICM Monitor

• Message number: 523

• Message text: Current number of HTTP server cache entries in use (in percent)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message ICM523 - Current number of HTTP server cache entries in use (in percent) ?

  The SAP error message ICM523 indicates that the current number of HTTP server cache entries in use has reached a certain threshold, which can lead to performance issues or even service interruptions if not addressed. This message is part of the Internet Communication Manager (ICM) in SAP, which handles HTTP requests.
  Cause:
  The ICM523 error typically occurs when:
  
  Cache Limit Reached: The number of entries in the HTTP server cache has reached a predefined limit, which can be configured in the SAP system.
  High Traffic: An increase in the number of HTTP requests or high traffic can lead to rapid consumption of cache entries.
  Inefficient Cache Configuration: The cache may not be optimally configured for the current workload, leading to quicker saturation.
  Stale or Unused Entries: Old or unused cache entries may not be purged efficiently, leading to unnecessary consumption of cache space.
  
  Solution:
  To resolve the ICM523 error, consider the following steps:
  
  
  Increase Cache Size:
  
  You can increase the size of the HTTP server cache by adjusting the parameters in the SAP profile. Look for parameters like icm/HTTP/enable_cache and icm/HTTP/max_cache_entries to increase the cache size.
  
  
  
  Monitor Cache Usage:
  
  Use transaction codes like ICM or SMICM to monitor the cache usage and identify patterns or spikes in traffic that may be causing the issue.
  
  
  
  Optimize Cache Configuration:
  
  Review and optimize the cache configuration settings. Ensure that the cache is set up to handle the expected load and that the cache entries are being managed effectively.
  
  
  
  Clear Cache:
  
  If the cache is filled with stale entries, consider clearing the cache. This can be done through the ICM administration interface or by using specific commands.
  
  
  
  Review Application Logic:
  
  Check the application logic to ensure that it is not generating excessive or unnecessary HTTP requests that could be filling the cache.
  
  
  
  Load Balancing:
  
  If applicable, consider implementing load balancing to distribute traffic more evenly across multiple servers, which can help reduce the load on a single ICM instance.
  
  
  
  Regular Maintenance:
  
  Implement regular maintenance tasks to monitor and manage cache entries, ensuring that old or unused entries are purged regularly.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or patches related to cache management and performance.
  Documentation: Refer to the official SAP documentation for detailed information on configuring and managing the ICM and its cache settings.
  Performance Monitoring: Utilize SAP's performance monitoring tools to keep an eye on system performance and cache usage trends over time.
  
  By following these steps, you should be able to address the ICM523 error and improve the performance of your SAP system's HTTP server cache.