How To Fix RT647 - Subtree with the most important memory sizes from Memory Management

SAP Error Message - Details

• Message type: E = Error

• Message class: RT - Monitoring infrastructure MSG and alert texts

• Message number: 647

• Message text: Subtree with the most important memory sizes from Memory Management

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 RT647 - Subtree with the most important memory sizes from Memory Management ?

  The SAP error message RT647 typically indicates an issue related to memory management within the SAP system. This error can arise when the system is unable to allocate sufficient memory for a particular operation or when the memory usage exceeds the configured limits.
  Cause:
  
  Memory Allocation Issues: The error may occur if the system is trying to allocate memory for a process, but there is not enough available memory.
  Configuration Limits: The memory settings in the SAP profile may not be optimized for the workload, leading to insufficient memory allocation.
  High Load: A sudden increase in workload or a memory leak in the application can lead to memory exhaustion.
  Subtree Memory Limits: The error may also indicate that a specific subtree (a part of the memory structure) has reached its maximum size.
  
  Solution:
  
  
  Check Memory Configuration:
  
  Review the SAP instance profile parameters related to memory management, such as abap/heap_area_dia, abap/heap_area_nondia, enque/table_size, and others.
  Adjust these parameters based on the system's requirements and workload.
  
  
  
  Monitor Memory Usage:
  
  Use transaction codes like ST02 (Tune Summary) and ST03 (Workload Analysis) to monitor memory usage and identify any bottlenecks.
  Check for any long-running processes or memory-intensive transactions that may be consuming excessive memory.
  
  
  
  Increase Memory Limits:
  
  If the memory limits are too low, consider increasing them in the instance profile. This may involve increasing the heap sizes or other relevant parameters.
  
  
  
  Analyze and Optimize Code:
  
  Review custom ABAP code for potential memory leaks or inefficient memory usage patterns.
  Optimize data processing logic to reduce memory consumption.
  
  
  
  System Restart:
  
  In some cases, a system restart may help clear memory and resolve temporary issues.
  
  
  
  Consult SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that may address this specific error or provide additional guidance.
  
  
  
  Related Information:
  
  Memory Management in SAP: Understanding how SAP manages memory is crucial. SAP uses different memory areas, such as the heap area for dialog processes and the extended memory for non-dialog processes.
  Transaction Codes: Familiarize yourself with transaction codes like ST02 (for memory analysis), ST03 (for workload analysis), and SM50 (for process overview) to monitor and manage memory usage effectively.
  SAP Basis Team: If you are not part of the SAP Basis team, it may be necessary to involve them for deeper analysis and configuration changes.
  
  By following these steps, you should be able to address the RT647 error and optimize memory management in your SAP system.