How To Fix RT645 - Response time of long-running dialog work processes (last value)

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 645

• Message text: Response time of long-running dialog work processes (last value)

What causes this issue?

Dialog work processes have a maximum duration that you can set in
profile parameter <LS>rdisp/max_wprun_time</>. You can monitor the
duration of long-running processes even before this maximum duration
with the help of this node.

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 RT645 - Response time of long-running dialog work processes (last value) ?

  The SAP error message RT645 indicates that the response time of long-running dialog work processes has exceeded acceptable limits. This can lead to performance issues in the SAP system, affecting user experience and system efficiency. Here’s a breakdown of the cause, potential solutions, and related information for this error message:
  Cause
  
  Long-Running Transactions: Certain transactions may take longer to process due to complex logic, large data volumes, or inefficient coding.
  System Load: High system load due to many concurrent users or background jobs can lead to longer response times.
  Database Performance: Slow database queries or locks can cause delays in processing requests.
  Resource Bottlenecks: Insufficient hardware resources (CPU, memory, I/O) can lead to performance degradation.
  Network Latency: High network latency can also contribute to longer response times for dialog processes.
  
  Solutions
  
  
  Analyze Long-Running Transactions:
  
  Use transaction ST05 (SQL Trace) or ST12 (Performance Trace) to identify slow transactions and optimize them.
  Review the code for inefficiencies and consider optimizing database queries.
  
  
  
  Monitor System Performance:
  
  Use transaction ST03N to analyze workload and identify peak times or problematic transactions.
  Check for any long-running background jobs that may be affecting dialog performance.
  
  
  
  Database Optimization:
  
  Ensure that database statistics are up to date.
  Optimize database indexes and queries to improve performance.
  
  
  
  Increase Resources:
  
  If the system is consistently under heavy load, consider scaling up hardware resources (CPU, memory).
  Review and adjust the number of dialog work processes in the instance profile (transaction RZ10).
  
  
  
  Review Configuration:
  
  Check the configuration of the SAP system and ensure that it is optimized for the current workload.
  Consider adjusting the timeout settings for dialog processes if necessary.
  
  
  
  Network Optimization:
  
  Investigate network performance and latency issues that may be affecting response times.
  Ensure that network infrastructure is adequate for the volume of traffic.
  
  
  
  Related Information
  
  
  Transaction Codes:
  
  ST03N: Workload Analysis
  ST05: SQL Trace
  ST12: Performance Trace
  RZ10: Profile Parameter Maintenance
  SM50: Work Process Overview
  
  
  
  SAP Notes: Check for any relevant SAP Notes that may address specific performance issues or provide guidance on optimizing dialog processes.
  
  
  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 mitigate the RT645 error and improve the overall performance of your SAP system.