How To Fix SAI_CACHE839 - External trigger (program &1), '&2' mode

SAP Error Message - Details

• Message type: E = Error

• Message class: SAI_CACHE - XI Configuration Cache

• Message number: 839

• Message text: External trigger (program &1), '&2' mode

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.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message SAI_CACHE839 - External trigger (program &1), '&2' mode ?

  The SAP error message SAI_CACHE839 typically relates to issues with the SAP caching mechanism, particularly when an external trigger is involved. This error can occur in various scenarios, often linked to the use of caching in SAP applications, especially when dealing with external programs or processes that interact with the SAP system.
  Cause:
  The error message SAI_CACHE839 indicates that there is an issue with the cache management when an external program (denoted by &1) is trying to access or modify the cache in a specific mode (denoted by &2). The causes can include:
  
  Invalid Cache State: The cache may be in an inconsistent state due to previous operations that did not complete successfully.
  Concurrency Issues: Multiple processes trying to access or modify the cache simultaneously can lead to conflicts.
  Configuration Issues: Incorrect configuration settings for caching in the SAP system.
  External Program Behavior: The external program may not be handling cache operations correctly, leading to unexpected states.
  
  Solution:
  To resolve the SAI_CACHE839 error, you can take the following steps:
  
  
  Check Cache Configuration: Review the caching configuration in your SAP system to ensure it is set up correctly. This includes checking parameters related to cache size, timeout settings, and any specific settings for the external program.
  
  
  Clear Cache: If the cache is in an inconsistent state, clearing the cache may resolve the issue. This can often be done through transaction codes like SM12 (for lock entries) or SM21 (for system logs) to identify and clear problematic entries.
  
  
  Review External Program Logic: If the error is triggered by an external program, review its logic to ensure it is correctly managing cache operations. This includes proper handling of cache reads and writes, as well as ensuring that it does not attempt to access the cache in an unsupported mode.
  
  
  Monitor for Concurrency Issues: If multiple processes are accessing the cache, consider implementing locking mechanisms or other concurrency control methods to prevent conflicts.
  
  
  Check SAP Notes: Look for relevant SAP Notes that may address this specific error. SAP frequently updates its knowledge base with solutions for known issues.
  
  
  Consult SAP Support: If the issue persists after trying the above solutions, consider reaching out to SAP Support for further assistance. They can provide more specific guidance based on your system configuration and the context of the error.
  
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM12, SM21, and SE80 for debugging and monitoring purposes.
  SAP Documentation: Review SAP documentation related to caching mechanisms and external program integration for best practices.
  Performance Monitoring: Use tools like SAP Solution Manager to monitor system performance and identify potential bottlenecks related to caching.
  
  By following these steps, you should be able to diagnose and resolve the SAI_CACHE839 error effectively.