How To Fix ICM526 - Number of hits in the HTTP cache (in percent)

SAP Error Message - Details

• Message type: E = Error

• Message class: ICM - Messages for ICM Monitor

• Message number: 526

• Message text: Number of hits in the HTTP cache (in percent)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message ICM526 - Number of hits in the HTTP cache (in percent) ?

  The SAP error message ICM526 indicates that the number of hits in the HTTP cache is being reported, specifically in terms of percentage. This message is part of the Internet Communication Manager (ICM) in SAP, which handles HTTP requests and responses.
  Cause:
  The ICM526 message is typically informational rather than an error. It provides insights into the performance of the HTTP cache. A low percentage of hits in the cache may indicate that the cache is not being utilized effectively, which can lead to increased load times and higher resource consumption on the server. Possible causes for low cache hits include:
  
  Cache Configuration: The cache may not be configured optimally for the types of requests being processed.
  Dynamic Content: If a significant amount of content is dynamic and not cacheable, this will reduce the hit rate.
  Cache Size: The cache size may be too small to hold frequently accessed content.
  Cache Expiration: Cached items may be expiring too quickly, leading to frequent misses.
  Request Patterns: The nature of incoming requests may not align with what is being cached.
  
  Solution:
  To address the issues indicated by the ICM526 message, consider the following solutions:
  
  
  Review Cache Configuration: Check the ICM settings in the SAP system to ensure that caching is enabled and configured correctly. This includes reviewing parameters such as icm/HTTP/enable_cache and icm/HTTP/size_cache.
  
  
  Increase Cache Size: If the cache is too small, consider increasing its size to accommodate more cached content. This can be done by adjusting the icm/HTTP/size_cache parameter.
  
  
  Optimize Content for Caching: Ensure that static content is being cached effectively. Review the application to identify which resources can be cached and adjust the caching strategy accordingly.
  
  
  Monitor Cache Performance: Use transaction codes like ICM or SMICM to monitor cache performance and analyze hit/miss ratios over time. This can help identify patterns and areas for improvement.
  
  
  Adjust Cache Expiration Settings: Review and adjust the expiration settings for cached items to ensure that frequently accessed content remains in the cache longer.
  
  
  Analyze Request Patterns: Look into the types of requests being made to the server. If there are many unique requests, consider strategies to consolidate or optimize them.
  
  
  Related Information:
  
  ICM Configuration Parameters: Familiarize yourself with relevant ICM parameters in the SAP documentation to understand how to configure caching effectively.
  Performance Monitoring Tools: Utilize SAP's performance monitoring tools to gain insights into system performance and caching behavior.
  SAP Notes: Check for any relevant SAP Notes that may address specific issues related to caching and the ICM526 message.
  
  By following these steps, you can improve the caching performance of your SAP system and potentially increase the hit rate reported by the ICM526 message.