How To Fix /PM0/3FD_MESSAGES021 - Unable to read record from internal cache

SAP Error Message - Details

• Message type: E = Error

• Message class: /PM0/3FD_MESSAGES -

• Message number: 021

• Message text: Unable to read record from internal cache

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.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /PM0/3FD_MESSAGES021 - Unable to read record from internal cache ?

  The SAP error message /PM0/3FD_MESSAGES021 Unable to read record from internal cache typically indicates an issue with the internal caching mechanism used by the SAP system. This error can occur in various contexts, often related to performance or data retrieval issues. Here are some potential causes, solutions, and related information:
  Causes:
  
  Cache Corruption: The internal cache may have become corrupted, leading to an inability to read records.
  Data Consistency Issues: There may be inconsistencies in the data that the cache is trying to access.
  Configuration Issues: Incorrect configuration settings for caching in the SAP system can lead to this error.
  System Performance: High load on the system or insufficient resources can cause cache read failures.
  Expired Cache Entries: The cache entries may have expired or been invalidated, leading to read failures.
  
  Solutions:
  
  
  Clear Cache: Try clearing the internal cache. This can often resolve issues related to cache corruption or expired entries.
  
  You can do this by using transaction codes like /n/PM0/CACHE or similar, depending on your SAP version and configuration.
  
  
  
  Check Configuration: Review the caching configuration settings in your SAP system. Ensure that they are set up correctly and optimized for your environment.
  
  
  Monitor System Performance: Use transaction codes like ST03N or ST04 to monitor system performance and check for any bottlenecks that may be affecting cache performance.
  
  
  Data Consistency Check: Run consistency checks on the relevant data to ensure that there are no underlying issues causing the cache read failure.
  
  
  SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error. There may be patches or updates available that resolve known issues.
  
  
  System Restart: In some cases, a system restart may help clear temporary issues affecting the cache.
  
  
  Contact SAP Support: If the issue persists after trying the above solutions, consider reaching out to SAP Support for further assistance. Provide them with detailed information about the error, including any relevant logs or transaction codes.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes for monitoring and managing cache, such as ST02 (Buffer Management) and ST03N (Workload Analysis).
  Performance Tuning: Consider reviewing performance tuning guides for SAP systems to optimize caching and overall system performance.
  Documentation: Refer to SAP documentation for your specific version to understand how caching works and best practices for managing it.
  
  By following these steps, you should be able to diagnose and potentially resolve the error message /PM0/3FD_MESSAGES021 Unable to read record from internal cache.