How To Fix RT643 - Number of background work processes in entire system

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 643

• Message text: Number of background work processes in entire system

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.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message RT643 - Number of background work processes in entire system ?

  The SAP error message RT643 indicates that the number of background work processes in the entire system has reached its limit. This can lead to issues with job scheduling and processing, as new background jobs may not be able to start until existing jobs complete.
  Cause:
  
  Configuration Limits: The number of background work processes is configured in the SAP system profile. If the limit is set too low for the workload, it can lead to this error.
  High Job Volume: A sudden increase in the number of background jobs can exceed the available work processes.
  Long-Running Jobs: If there are jobs that take a long time to complete, they can occupy the available work processes, preventing new jobs from starting.
  System Performance Issues: If the system is under heavy load or experiencing performance issues, it may not be able to process background jobs efficiently.
  
  Solution:
  
  
  Increase Background Work Processes:
  
  You can increase the number of background work processes in the SAP system profile. This is done by modifying the rdisp/wp_no_btc parameter in the instance profile.
  After making changes, you will need to restart the SAP instance for the changes to take effect.
  
  
  
  Monitor and Optimize Jobs:
  
  Review the background jobs that are currently running. Identify any long-running jobs and determine if they can be optimized or scheduled during off-peak hours.
  Use transaction codes like SM37 to monitor job status and SM50 to check the work process overview.
  
  
  
  Job Scheduling:
  
  Schedule jobs in a way that balances the load on the system. Use the SAP job scheduling tools to stagger job execution times.
  Consider using the SM36 transaction to manage job scheduling effectively.
  
  
  
  System Performance Tuning:
  
  Investigate and resolve any performance issues that may be affecting the system. This could involve checking database performance, system resources (CPU, memory, I/O), and network issues.
  
  
  
  Review System Logs:
  
  Check the system logs for any additional errors or warnings that may provide insight into the cause of the issue.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM37: Job Monitoring
  SM50: Work Process Overview
  SM36: Job Scheduling
  RZ10: Profile Parameter Maintenance
  
  
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional guidance or patches related to background processing.
  
  
  Documentation: Refer to the SAP Help Portal for detailed documentation on background processing and system configuration.
  
  
  By addressing the configuration and workload management, you can resolve the RT643 error and ensure that background jobs are processed efficiently in your SAP system.