How To Fix CSM_VMC034 - Size of the Java Heap for each VM

SAP Error Message - Details

• Message type: E = Error

• Message class: CSM_VMC - Messages for VM Container Monitoring

• Message number: 034

• Message text: Size of the Java Heap for each VM

What causes this issue?

The Java heap is the memory area in which each Java VM stores its Java
objects. The size of the Java heap is specified in the profile parameter
vmcj/option/maxJavaHeap.
You can find more information about the memory classes in the VM
Container in the online documentation under
<DS:KENO.001560AA0E081DEB91E241270609CAF7>Memory Management in the VM
Container</>.

System Response

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

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CSM_VMC034 - Size of the Java Heap for each VM ?

  The SAP error message CSM_VMC034 typically relates to issues with the Java Virtual Machine (JVM) heap size configuration in an SAP system. This error can occur when the Java heap size is not set correctly, leading to performance issues or failures in the Java application server.
  Cause:
  
  Insufficient Heap Size: The Java heap size may be set too low for the applications running on the JVM, leading to out-of-memory errors.
  Excessive Heap Size: Conversely, setting the heap size too high can lead to inefficient memory usage and can cause the system to run out of physical memory.
  Configuration Errors: Incorrect configuration in the instance profile or startup parameters for the JVM can lead to this error.
  Resource Limitations: The underlying operating system may have limitations on memory allocation, which can affect the JVM's ability to allocate the required heap size.
  
  Solution:
  
  
  Adjust Heap Size:
  
  Access the SAP NetWeaver Administrator or the relevant configuration files.
  Modify the JVM parameters to set an appropriate heap size. This is typically done by adjusting the -Xms (initial heap size) and -Xmx (maximum heap size) parameters.
  Example: -Xms512m -Xmx2048m (sets the initial heap size to 512 MB and the maximum to 2048 MB).
  
  
  
  Monitor Memory Usage:
  
  Use monitoring tools to analyze memory usage patterns and determine the optimal heap size.
  Tools like SAP Solution Manager or third-party monitoring solutions can help in identifying memory bottlenecks.
  
  
  
  Review Configuration:
  
  Check the instance profile settings in the SAP system to ensure that the JVM parameters are correctly set.
  Ensure that there are no conflicting settings in the configuration files.
  
  
  
  Operating System Settings:
  
  Ensure that the operating system has sufficient resources available and that there are no limits set on the memory allocation for the JVM.
  Check for any OS-level configurations that might restrict memory usage.
  
  
  
  Restart the Application Server:
  
  After making changes to the heap size or configuration, restart the Java application server to apply the new settings.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to JVM configuration and performance tuning for specific guidance and best practices.
  Documentation: Refer to the official SAP documentation for your specific version of the NetWeaver Application Server for detailed instructions on configuring JVM parameters.
  Performance Tuning: Consider engaging in performance tuning practices to optimize the overall performance of the Java applications running on the SAP system.
  
  By addressing the heap size configuration and monitoring the system's performance, you can resolve the CSM_VMC034 error and improve the stability and efficiency of your SAP Java applications.