How To Fix RT128 - Average dispatcher wait time per dialog step

SAP Error Message - Details

• Message type: E = Error

• Message class: RT - Monitoring infrastructure MSG and alert texts

• Message number: 128

• Message text: Average dispatcher wait time per dialog step

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 RT128 - Average dispatcher wait time per dialog step ?

  The SAP error message RT128, which refers to "Average dispatcher wait time per dialog step," is typically related to performance issues in the SAP system. This message indicates that the average time that a dialog step spends waiting for a dispatcher to become available is higher than expected. This can lead to performance degradation and a poor user experience.
  Causes:
  
  High Load on the System: If there are too many users or processes running simultaneously, the dispatcher may become overloaded, leading to increased wait times.
  Insufficient Resources: The application server may not have enough CPU, memory, or other resources to handle the current workload efficiently.
  Configuration Issues: Incorrect configuration of the SAP system parameters, such as the number of work processes or the dispatcher settings, can lead to inefficiencies.
  Long-running Transactions: If certain transactions take a long time to complete, they can block the dispatcher and increase wait times for other users.
  Network Latency: High network latency can also contribute to longer wait times, especially if users are accessing the system remotely.
  
  Solutions:
  
  Monitor System Performance: Use transaction codes like ST03N (Workload Analysis) and ST06 (Operating System Monitor) to analyze system performance and identify bottlenecks.
  Increase Resources: If the system is consistently under heavy load, consider adding more application servers or increasing the resources (CPU, memory) of existing servers.
  Optimize Configuration: Review and optimize the configuration of the SAP system, including the number of dialog work processes and dispatcher settings. Ensure that they are aligned with the expected workload.
  Analyze Long-running Transactions: Identify and optimize any long-running transactions that may be causing delays. This can involve tuning the code or database queries involved.
  Load Balancing: Implement load balancing strategies to distribute user requests more evenly across available application servers.
  Regular Maintenance: Perform regular system maintenance, including database optimization and cleanup of unnecessary data, to ensure optimal performance.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as ST03N (Workload Analysis), ST06 (OS Monitor), SM50 (Process Overview), and SM66 (Global Work Process Overview) to monitor and analyze system performance.
  SAP Notes: Check SAP Notes for any specific recommendations or patches related to performance issues and the RT128 message.
  Performance Tuning Guides: Refer to SAP's performance tuning guides for best practices on optimizing SAP systems.
  
  By addressing the underlying causes and implementing the suggested solutions, you can reduce the average dispatcher wait time and improve overall system performance.