How To Fix CNV642 - Index-building tasks (if there were any) were de-selected

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV - Conversion: Messages for Conversion Services (CNCC)

• Message number: 642

• Message text: Index-building tasks (if there were any) were de-selected

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CNV642 - Index-building tasks (if there were any) were de-selected ?

  The SAP error message "CNV642 Index-building tasks (if there were any) were de-selected" typically occurs during data migration or conversion processes, particularly when using the SAP S/4HANA Migration Cockpit or similar tools. This message indicates that certain index-building tasks that were supposed to be executed as part of the migration process have been de-selected or skipped.
  Cause:
  
  Configuration Issues: The migration settings may not have been configured correctly, leading to the de-selection of index-building tasks.
  Performance Considerations: In some cases, index-building tasks may be de-selected to improve performance during the migration process, especially if the data volume is large.
  User Intervention: Users may have manually de-selected these tasks during the migration setup.
  Technical Constraints: There may be technical constraints or limitations in the system that prevent the execution of index-building tasks.
  
  Solution:
  
  Review Migration Settings: Check the migration settings in the SAP Migration Cockpit or the relevant tool you are using. Ensure that index-building tasks are selected and configured correctly.
  Consult Documentation: Refer to the official SAP documentation for the migration tool you are using to understand the implications of de-selecting index-building tasks and how to enable them.
  Performance Tuning: If performance is a concern, consider running the migration in smaller batches or during off-peak hours to allow for index-building tasks to be executed without impacting system performance.
  Manual Execution: If necessary, you can manually execute the index-building tasks after the migration process is complete. This may involve running specific SQL commands or using SAP transaction codes to rebuild indexes.
  Check for Errors: Look for any other error messages or logs that may provide additional context on why the index-building tasks were de-selected.
  
  Related Information:
  
  SAP Notes: Check for relevant SAP Notes that may address this specific error message or provide guidance on best practices for data migration.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  Performance Monitoring: After migration, monitor the performance of the system to ensure that the absence of certain indexes does not negatively impact system operations.
  
  By following these steps, you should be able to address the issue related to the CNV642 error message and ensure a successful data migration process.