How To Fix CRM_MKTTG_SEG_BWA303 - Shared memory error for MDD: Attach for write not possible

SAP Error Message - Details

• Message type: E = Error

• Message class: CRM_MKTTG_SEG_BWA - Messages for CRM Segment Builder BWA Access

• Message number: 303

• Message text: Shared memory error for MDD: Attach for write not possible

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 CRM_MKTTG_SEG_BWA303 - Shared memory error for MDD: Attach for write not possible ?

  The SAP error message CRM_MKTTG_SEG_BWA303 indicates a shared memory error related to the Marketing Data Distribution (MDD) process in SAP CRM. This error typically occurs when the system is unable to attach to the shared memory segment for writing, which can be caused by several factors.
  Causes:
  
  Insufficient Shared Memory: The shared memory segment may not have enough space allocated for the operation being performed.
  Memory Limit Reached: The maximum limit for shared memory segments may have been reached, preventing new attachments.
  Configuration Issues: Incorrect configuration settings in the SAP system related to shared memory management.
  System Resource Constraints: High system load or resource constraints may lead to issues with memory allocation.
  Kernel Issues: Bugs or issues in the SAP kernel version being used can also lead to shared memory errors.
  
  Solutions:
  
  
  Increase Shared Memory Allocation:
  
  You can increase the shared memory allocation in the SAP system profile parameters. Look for parameters like shmmax and shmall in the operating system and adjust them accordingly.
  In the SAP system, you can check and modify parameters using transaction RZ10 or RZ11.
  
  
  
  Check and Adjust Kernel Parameters:
  
  Ensure that the kernel parameters for shared memory are set correctly. This may involve consulting with your system administrator or basis team.
  
  
  
  Monitor System Resources:
  
  Use tools like top, vmstat, or free on Unix/Linux systems to monitor memory usage and ensure that the system is not under heavy load.
  
  
  
  Restart the SAP System:
  
  If the issue persists, consider restarting the SAP system to clear any stale shared memory segments.
  
  
  
  Check for Updates:
  
  Ensure that your SAP system is up to date with the latest patches and kernel updates, as these may contain fixes for known issues.
  
  
  
  Consult SAP Notes:
  
  Search for relevant SAP Notes in the SAP Support Portal that may address this specific error. There may be specific recommendations or fixes provided by SAP.
  
  
  
  Review Logs:
  
  Check the system logs (transaction SM21) and the developer traces (transaction ST11) for any additional error messages or warnings that could provide more context about the issue.
  
  
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for more details on shared memory management and configuration.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  SAP Support: If the problem persists and you have a support contract, consider reaching out to SAP Support for assistance.
  
  By following these steps, you should be able to diagnose and resolve the CRM_MKTTG_SEG_BWA303 shared memory error in your SAP system.