How To Fix GW020 - No memory allocation exists

SAP Error Message - Details

• Message type: E = Error

• Message class: GW - Message Texts for Gateway

• Message number: 020

• Message text: No memory allocation exists

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.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

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Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message GW020 - No memory allocation exists ?

  The SAP error message GW020 ("No memory allocation exists") typically indicates that the SAP Gateway is unable to allocate memory for processing requests. This can occur due to various reasons, including system resource limitations, configuration issues, or memory leaks.
  Causes:
  
  Insufficient Memory: The system may not have enough physical or virtual memory available to handle the requests.
  Configuration Issues: The SAP Gateway may not be configured correctly, leading to inefficient memory usage.
  Memory Leaks: Long-running processes or poorly designed applications can lead to memory leaks, consuming available memory over time.
  High Load: A sudden spike in user requests or background jobs can exhaust available memory.
  Operating System Limits: The underlying operating system may have limits on memory allocation that are being reached.
  
  Solutions:
  
  
  Check System Resources:
  
  Monitor the system's memory usage using tools like SAP transaction ST06 or OS-level monitoring tools.
  Ensure that there is sufficient physical and virtual memory available.
  
  
  
  Adjust SAP Gateway Parameters:
  
  Review and adjust the SAP Gateway parameters in the instance profile (e.g., gw/Max_Connections, gw/Max_Users, etc.) to optimize memory usage.
  Consider increasing the gw/Max_Connections parameter if the system is under heavy load.
  
  
  
  Restart the SAP Gateway:
  
  If the issue persists, restarting the SAP Gateway can help free up memory that may be held by processes.
  
  
  
  Check for Memory Leaks:
  
  Analyze the system for any long-running processes or custom code that may be causing memory leaks.
  Use transaction ST22 to check for dumps that may indicate issues with specific programs.
  
  
  
  Increase Memory Allocation:
  
  If the server has the capacity, consider increasing the memory allocation for the SAP instance.
  Adjust the operating system settings to allow for more memory allocation if necessary.
  
  
  
  Review Background Jobs:
  
  Check for any background jobs that may be consuming excessive memory and optimize or reschedule them as needed.
  
  
  
  Consult SAP Notes:
  
  Look for relevant SAP Notes that may address specific issues related to memory allocation and the GW020 error.
  
  
  
  Related Information:
  
  Transaction Codes: Use transactions like ST06 (Operating System Monitor), ST22 (Dump Analysis), and SM50 (Process Overview) to monitor and analyze system performance.
  SAP Support: If the issue persists after trying the above solutions, consider reaching out to SAP Support for further assistance.
  Documentation: Review SAP documentation for best practices on memory management and configuration for the SAP Gateway.
  
  By following these steps, you should be able to diagnose and resolve the GW020 error effectively.