How To Fix /IWFND/CM_MGW535 - An exception occurred when accessing cached data in shared memory

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWFND/CM_MGW -

• Message number: 535

• Message text: An exception occurred when accessing cached data in shared memory

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 /IWFND/CM_MGW535 - An exception occurred when accessing cached data in shared memory ?

  The SAP error message /IWFND/CM_MGW535 indicates that there was an exception when accessing cached data in shared memory, typically related to the SAP Gateway framework. This error can occur for various reasons, including issues with the cache, memory allocation, or inconsistencies in the data being accessed.
  Causes:
  
  Cache Corruption: The shared memory cache may be corrupted or inconsistent, leading to access issues.
  Memory Issues: Insufficient memory allocation for the SAP Gateway or the underlying application.
  Data Inconsistency: Changes in the underlying data model or database that are not reflected in the cached data.
  Configuration Issues: Incorrect configuration settings for the SAP Gateway or related components.
  System Load: High system load or resource contention that affects the ability to access shared memory.
  
  Solutions:
  
  
  Clear Cache: 
  
  Use transaction code /IWFND/CACHE to clear the cache. This can help resolve issues related to stale or corrupted cache entries.
  
  
  
  Check Memory Settings:
  
  Ensure that the memory settings for the SAP Gateway are appropriately configured. You may need to increase the memory allocation if the system is under heavy load.
  
  
  
  Restart Services:
  
  Restart the SAP Gateway service or the entire SAP system to refresh the memory and clear any temporary issues.
  
  
  
  Check for Updates:
  
  Ensure that your SAP system is up to date with the latest support packages and patches, as these may contain fixes for known issues.
  
  
  
  Review Logs:
  
  Check the application logs (transaction SLG1) and the Gateway logs (transaction /IWFND/ERROR_LOG) for more detailed error messages that can provide insights into the root cause.
  
  
  
  Analyze System Performance:
  
  Use transaction ST02 (Tune Summary) to analyze memory usage and identify any bottlenecks or issues with the shared memory.
  
  
  
  Consult SAP Notes:
  
  Search for relevant SAP Notes in the SAP Support Portal that may address this specific error message or provide additional troubleshooting steps.
  
  
  
  Engage SAP Support:
  
  If the issue persists after trying the above solutions, consider reaching out to SAP Support for further assistance.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  /IWFND/CACHE: To manage the cache.
  /IWFND/ERROR_LOG: To view error logs related to the SAP Gateway.
  SLG1: To check application logs for additional context on the error.
  
  
  
  Documentation: Review the SAP Gateway documentation for best practices on memory management and caching strategies.
  
  
  By following these steps, you should be able to diagnose and resolve the /IWFND/CM_MGW535 error effectively.