How To Fix ICM527 - Number of hits in the HTTP memory cache (in percent)

SAP Error Message - Details

• Message type: E = Error

• Message class: ICM - Messages for ICM Monitor

• Message number: 527

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

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message ICM527 - Number of hits in the HTTP memory cache (in percent) ?

  The SAP error message ICM527 indicates that the number of hits in the HTTP memory cache has reached a certain threshold, which can affect the performance of the Internet Communication Manager (ICM). This message is typically related to the configuration and performance of the HTTP cache in the SAP system.
  Cause:
  
  High Cache Usage: The error suggests that the cache is being heavily utilized, which may lead to performance degradation if the cache is not managed properly.
  Configuration Issues: The cache settings may not be optimized for the current workload or usage patterns.
  Insufficient Memory: The allocated memory for the HTTP cache may be insufficient to handle the volume of requests being processed.
  Frequent Cache Misses: If the cache is not able to serve requests efficiently, it may lead to a high number of cache misses, which can trigger this warning.
  
  Solution:
  
  
  Increase Cache Size: If the cache is frequently hitting its limits, consider increasing the size of the HTTP memory cache. This can be done by adjusting the parameters in the ICM configuration.
  
  You can modify the icm/HTTP/max_cache_size parameter in the SAP profile to allocate more memory for the cache.
  
  
  
  Optimize Cache Configuration: Review and optimize the cache settings to ensure they are appropriate for your application’s needs. This includes:
  
  Setting appropriate expiration times for cached objects.
  Configuring cache policies to better suit the access patterns of your users.
  
  
  
  Monitor Cache Performance: Use transaction codes like ICM or SMICM to monitor the performance of the ICM and the cache. Look for metrics related to cache hits, misses, and overall performance.
  
  
  Review Application Logic: If certain requests are not being cached effectively, review the application logic to ensure that cacheable responses are being returned correctly.
  
  
  Regular Maintenance: Implement regular maintenance tasks to clear stale or unnecessary cache entries, which can help improve cache performance.
  
  
  Related Information:
  
  ICM Configuration Parameters: Familiarize yourself with relevant ICM parameters in the SAP documentation, such as icm/HTTP/enable_cache, icm/HTTP/max_cache_size, and others that control caching behavior.
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or patches related to caching issues.
  Performance Monitoring Tools: Utilize SAP’s performance monitoring tools to analyze the overall performance of the ICM and identify bottlenecks.
  
  By addressing the underlying causes and optimizing the configuration, you can mitigate the impact of the ICM527 error and improve the performance of your SAP system.