How To Fix ESH_RUBU_MSG026 - &1 bytes of shared memory required for runtime buffer

SAP Error Message - Details

• Message type: E = Error

• Message class: ESH_RUBU_MSG - ESH RuBu - Messages

• Message number: 026

• Message text: &1 bytes of shared memory required for runtime buffer

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message ESH_RUBU_MSG026 - &1 bytes of shared memory required for runtime buffer ?

  The SAP error message ESH_RUBU_MSG026 indicates that there is an issue related to the shared memory allocation for the runtime buffer in the SAP system. Specifically, it states that a certain number of bytes of shared memory is required but is not available.
  Cause:
  
  Insufficient Shared Memory: The most common cause of this error is that the shared memory allocated for the SAP instance is insufficient to handle the current workload or the specific operation being performed.
  Configuration Issues: The configuration settings for shared memory in the SAP system may not be set correctly, leading to inadequate memory allocation.
  High Load: If the system is under heavy load, it may require more shared memory than what is currently allocated.
  Memory Leaks: There could be memory leaks in the application or other processes consuming shared memory, leading to exhaustion of available memory.
  
  Solution:
  
  
  Increase Shared Memory Allocation:
  
  You can increase the shared memory allocation by adjusting the parameters in the SAP profile. Look for parameters like shmmax, shmmin, and shmall in the operating system settings.
  For example, on a Unix/Linux system, you can modify /etc/sysctl.conf to increase the shared memory limits and then run sysctl -p to apply the changes.
  
  
  
  Check SAP Profile Parameters:
  
  Review the instance profile parameters related to memory, such as rdisp/Shared_Pool_Size, rdisp/Buffer_Size, and rdisp/Max_Wait_Dia.
  Adjust these parameters based on the requirements of your application and the available system resources.
  
  
  
  Monitor System Load:
  
  Use monitoring tools to check the current memory usage and identify if there are any processes consuming excessive memory.
  If the system is under heavy load, consider optimizing the workload or scaling up the resources.
  
  
  
  Restart the SAP Instance:
  
  In some cases, a simple restart of the SAP instance can help clear up memory issues and reallocate shared memory properly.
  
  
  
  Consult SAP Notes:
  
  Check the SAP Support Portal for any relevant SAP Notes that may provide additional guidance or patches related to this error.
  
  
  
  Related Information:
  
  SAP Basis Team: If you are not familiar with system administration tasks, it is advisable to involve your SAP Basis team to assist with memory configuration and troubleshooting.
  System Logs: Review the system logs (transaction SM21) for any additional error messages or warnings that may provide more context about the issue.
  Performance Tuning: Consider conducting a performance tuning exercise to optimize memory usage and improve overall system performance.
  
  By following these steps, you should be able to resolve the error message ESH_RUBU_MSG026 and ensure that your SAP system has adequate shared memory for its operations.