How To Fix /SAPAPO/OM_PERF_MSG302 - Heap: Create/delete 50MB in chunks of random size between 1 and 10kB

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/OM_PERF_MSG -

• Message number: 302

• Message text: Heap: Create/delete 50MB in chunks of random size between 1 and 10kB

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 /SAPAPO/OM_PERF_MSG302 - Heap: Create/delete 50MB in chunks of random size between 1 and 10kB ?

  The SAP error message /SAPAPO/OM_PERF_MSG302 typically relates to performance issues in the SAP Advanced Planning and Optimization (APO) module, specifically concerning memory management. This error indicates that the system is attempting to allocate or deallocate memory in chunks of random sizes, which can lead to inefficiencies and potential performance degradation.
  Cause:
  
  Memory Fragmentation: The error may arise due to memory fragmentation, where the available memory is divided into small, non-contiguous blocks, making it difficult for the system to allocate larger chunks of memory efficiently.
  High Memory Usage: If the system is under heavy load or if there are memory leaks in the application, it can lead to excessive memory allocation requests.
  Configuration Issues: Incorrect configuration settings for memory management in SAP can also lead to this error.
  Large Data Volumes: Processing large datasets or complex calculations can exacerbate memory allocation issues.
  
  Solution:
  
  
  Memory Management Configuration:
  
  Review and optimize the memory settings in the SAP system. This includes parameters like abap/heap_area_dia, abap/heap_area_nondia, and abap/heap_area_total.
  Ensure that the system has sufficient memory allocated to handle the workload.
  
  
  
  Monitor and Optimize Performance:
  
  Use transaction codes like ST02 (Tune Summary) and ST04 (Database Performance) to monitor memory usage and identify bottlenecks.
  Analyze the workload and optimize the processes that are consuming excessive memory.
  
  
  
  Database Optimization:
  
  Ensure that the database is properly tuned and that indexes are optimized to reduce the load on the application server.
  
  
  
  Patch and Upgrade:
  
  Check for any available patches or updates for your SAP system that may address known memory management issues.
  
  
  
  Review Custom Code:
  
  If there are custom ABAP programs or enhancements, review them for memory efficiency. Look for any loops or operations that may be causing excessive memory usage.
  
  
  
  Increase Hardware Resources:
  
  If the system consistently runs out of memory, consider upgrading the hardware resources (RAM) of the application server.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to memory management and performance issues in APO. SAP frequently releases notes that provide fixes or workarounds for specific issues.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have implemented.
  Performance Tuning Guides: Refer to SAP's performance tuning guides for APO, which provide best practices for optimizing system performance.
  
  By addressing the underlying causes and implementing the suggested solutions, you should be able to mitigate the error and improve the performance of your SAP APO system.