How To Fix UJA_EXCEPTION391 - Shared object memory is not enough for environment &1. &2 MB is required.

SAP Error Message - Details

• Message type: E = Error

• Message class: UJA_EXCEPTION - BPC: Admin exception message class

• Message number: 391

• Message text: Shared object memory is not enough for environment &1. &2 MB is required.

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message UJA_EXCEPTION391 - Shared object memory is not enough for environment &1. &2 MB is required. ?

  The SAP error message UJA_EXCEPTION391 indicates that there is insufficient shared object memory allocated for the SAP environment. This can occur when the system is trying to allocate memory for processes or operations, but the available shared memory is below the required threshold.
  Cause:
  
  Insufficient Shared Memory Configuration: The shared memory settings in the operating system or SAP profile parameters may not be configured to meet the needs of the SAP application.
  High Load on the System: If the system is under heavy load or if there are many concurrent users, the demand for shared memory may exceed the current allocation.
  Memory Leaks: There could be memory leaks in the application or in custom code that is consuming more memory than expected.
  Improperly Configured Parameters: Parameters related to memory allocation in the SAP system may not be set correctly.
  
  Solution:
  
  
  Increase Shared Memory Allocation:
  
  You can increase the shared memory allocation by modifying the kernel parameters on the operating system level. This typically involves changing parameters like shmmax, shmmin, shmni, and shmall in the /etc/sysctl.conf file (for Linux systems).
  For example, you might set:
  kernel.shmmax = <new_value>
  kernel.shmall = <new_value>
  
  After making changes, apply them using the command:
  sysctl -p
  
  
  
  
  Adjust SAP Profile Parameters:
  
  Check and adjust the SAP profile parameters related to memory. You can do this using transaction RZ10. Look for parameters like abap/shared_objects_size_MB and increase its value as needed.
  
  
  
  Monitor System Load:
  
  Use monitoring tools to check the current load on the system and identify if there are any processes consuming excessive memory. This can help in diagnosing if the issue is due to high load.
  
  
  
  Review Custom Code:
  
  If you suspect that custom code might be causing memory leaks, review the code for any potential issues and optimize it.
  
  
  
  Restart the SAP System:
  
  In some cases, a restart of the SAP system may help to clear up memory issues temporarily, but it is not a long-term solution.
  
  
  
  Consult SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that might address this specific error or provide additional guidance.
  
  
  
  Related Information:
  
  SAP Memory Management: Understanding how SAP manages memory can help in configuring the system appropriately. SAP uses various types of memory, including shared memory, heap memory, and paging memory.
  Operating System Documentation: Refer to the documentation for your specific operating system for details on configuring shared memory settings.
  SAP Basis Administration: If you are not familiar with SAP Basis administration, it may be beneficial to consult with a Basis administrator or SAP support for assistance in resolving this issue.
  
  By following these steps, you should be able to resolve the UJA_EXCEPTION391 error and ensure that your SAP environment has sufficient shared memory for its operations.