How To Fix RZ302 - Operation only allowed on Enqueue server.

SAP Error Message - Details

• Message type: E = Error

• Message class: RZ - Messages for Computing Center Management System

• Message number: 302

• Message text: Operation only allowed on Enqueue server.

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RZ302 - Operation only allowed on Enqueue server. ?

  The SAP error message RZ302, "Operation only allowed on Enqueue server," typically occurs when an operation that requires access to the enqueue server is attempted on a different server in a distributed SAP system. The enqueue server is responsible for managing locks in the SAP system, and certain operations must be executed on this server to ensure data integrity and consistency.
  Cause:
  
  Incorrect Server Context: The operation is being executed on a server that is not designated as the enqueue server. In a distributed SAP environment, the enqueue server is usually a dedicated instance that handles lock management.
  Configuration Issues: There may be misconfigurations in the SAP system that prevent the correct identification of the enqueue server.
  Network Issues: Network problems may prevent the application server from communicating with the enqueue server.
  System Load: High load on the enqueue server may lead to temporary unavailability, causing operations to fail.
  
  Solution:
  
  Identify the Enqueue Server: Use transaction code SM51 to view the list of application servers and identify which one is the enqueue server. The enqueue server is typically marked with a specific flag.
  Execute on the Correct Server: Ensure that the operation is being executed on the enqueue server. If you are using a transaction or program that requires lock management, make sure to run it on the correct server.
  Check Configuration: Verify the configuration settings in the SAP system to ensure that the enqueue server is correctly defined. This can be checked in the instance profile parameters.
  Restart Services: If the enqueue server is not responding, consider restarting the enqueue server or the entire SAP system if necessary.
  Check Network Connectivity: Ensure that there are no network issues preventing communication between the application server and the enqueue server.
  Monitor System Load: If the enqueue server is under heavy load, consider optimizing performance or scaling resources to handle the load better.
  
  Related Information:
  
  Transaction Codes: 
  
  SM51: To view the list of application servers.
  SM12: To view and manage lock entries.
  RZ10: To manage instance profiles and parameters.
  
  
  SAP Notes: Check SAP Notes related to enqueue server issues for specific patches or updates that may address known problems.
  Documentation: Refer to SAP Help documentation for more details on the enqueue server and its role in the SAP architecture.
  
  If the problem persists after trying the above solutions, it may be necessary to consult with your SAP Basis team or SAP support for further assistance.