How To Fix RZ457 - Dispatcher queue overflow

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 457

• Message text: Dispatcher queue overflow

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 RZ457 - Dispatcher queue overflow ?

  The SAP error message RZ457, which indicates "Dispatcher queue overflow," typically occurs when the number of requests in the dispatcher queue exceeds the configured limits. This can lead to performance issues and may prevent users from logging into the system or executing transactions.
  Causes:
  
  High Load: A sudden increase in user activity or background jobs can overwhelm the dispatcher.
  Insufficient Resources: The system may not have enough resources (CPU, memory) to handle the current workload.
  Configuration Issues: The dispatcher settings may not be optimized for the current usage patterns.
  Long-Running Transactions: If transactions take too long to complete, they can block the dispatcher from processing new requests.
  Network Issues: Delays in network communication can cause requests to pile up in the dispatcher queue.
  
  Solutions:
  
  
  Increase Dispatcher Capacity:
  
  Adjust the parameters in the instance profile to increase the number of work processes (e.g., rdisp/wp_no_dia, rdisp/wp_no_btc, etc.).
  Ensure that the rdisp/max_wprun_time parameter is set appropriately to avoid long-running processes.
  
  
  
  Monitor and Optimize Performance:
  
  Use transaction codes like ST03N, ST06, and SM50 to monitor system performance and identify bottlenecks.
  Analyze long-running transactions and optimize them if necessary.
  
  
  
  Load Balancing:
  
  If you have multiple application servers, ensure that the load is balanced across them. You can use the SAP Load Balancer or adjust the settings in the SAP GUI.
  
  
  
  Increase Hardware Resources:
  
  If the system is consistently under heavy load, consider upgrading the hardware (CPU, RAM) to better handle the workload.
  
  
  
  Review Background Jobs:
  
  Check for any background jobs that may be consuming excessive resources and adjust their scheduling or processing.
  
  
  
  Check for Network Issues:
  
  Ensure that there are no network issues affecting communication between the application server and the database or between the application servers themselves.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  RZ10: To change instance profile parameters.
  SM50: To monitor work processes.
  ST22: To check for dumps that may indicate issues.
  SM66: To monitor global work processes across all instances.
  
  
  
  SAP Notes: Check for relevant SAP Notes that may provide additional guidance or patches related to dispatcher issues.
  
  
  Documentation: Refer to the SAP Help Portal for detailed documentation on performance tuning and dispatcher configuration.
  
  
  By addressing the underlying causes and implementing the suggested solutions, you can mitigate the "Dispatcher queue overflow" error and improve the overall performance of your SAP system.