How To Fix UGMD_TOOLS391 - Overflow of shared memory

SAP Error Message - Details

• Message type: E = Error

• Message class: UGMD_TOOLS - Messages for Package UGMD_TOOLS

• Message number: 391

• Message text: Overflow of shared memory

What causes this issue?

Shared memory has overflowed.

System Response

The system has temporarily deactivated the usage of the shared memory on
application server '&V1&'. This will worsen performance.

How to fix this error?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Procedure for System Administrators

Increase the memory space that is reserved for the shared memory. You do
this by calling up transaction <DS:TRAN.RZ11>Profile Parameter
Maintenance</> and changing the following parameters:
<AB>rsdb/esm/buffersize_kb</>
<AB>rsdb/esm/max_objects</>

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message UGMD_TOOLS391 - Overflow of shared memory ?

  The SAP error message "UGMD_TOOLS391 Overflow of shared memory" typically indicates that the shared memory allocated for a specific process or operation has exceeded its limit. This can occur in various scenarios, such as when processing large datasets or when multiple processes are trying to access shared memory simultaneously.
  Causes:
  
  Insufficient Shared Memory Allocation: The shared memory settings in the SAP system may not be configured to handle the workload, leading to overflow.
  High Concurrency: Multiple users or processes trying to access shared memory at the same time can lead to contention and overflow.
  Large Data Processing: Operations that involve large amounts of data, such as bulk data uploads or complex calculations, can consume more memory than allocated.
  Configuration Issues: Incorrect configuration of the SAP instance parameters related to memory management.
  
  Solutions:
  
  
  Increase Shared Memory Allocation:
  
  You can increase the shared memory allocation in the SAP system profile parameters. Look for parameters like shmmax, shmmin, and shmall in the operating system settings and adjust them accordingly.
  In the SAP instance profile, you may need to adjust parameters such as abap/shared_memory or abap/heap_area_total.
  
  
  
  Optimize Data Processing:
  
  If the error occurs during specific operations, consider optimizing the data processing logic to reduce memory consumption. This could involve breaking down large operations into smaller batches.
  
  
  
  Monitor and Analyze Memory Usage:
  
  Use transaction codes like ST02 (Tune Summary) and ST03 (Workload Analysis) to monitor memory usage and identify bottlenecks.
  Analyze the workload to determine if there are specific transactions or processes that are consuming excessive memory.
  
  
  
  Review and Adjust Configuration:
  
  Review the configuration of your SAP system to ensure that it is optimized for your workload. This may involve consulting with your SAP Basis team or referring to SAP documentation for best practices.
  
  
  
  Restart the SAP Instance:
  
  In some cases, a simple restart of the SAP instance can clear up memory issues temporarily, but this is not a long-term solution.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to memory management and the specific error message for any patches or updates that may address the issue.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have implemented.
  Documentation: Refer to the official SAP documentation for guidelines on memory management and configuration settings.
  
  If the problem persists after trying these solutions, it may be necessary to engage SAP support for further assistance.