How To Fix RSDD020 - No aggregates could be summarized for optimization

SAP Error Message - Details

• Message type: E = Error

• Message class: RSDD - Message class for data manager

• Message number: 020

• Message text: No aggregates could be summarized for optimization

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RSDD020 - No aggregates could be summarized for optimization ?

  The SAP error message RSDD020, which states "No aggregates could be summarized for optimization," typically occurs in the context of SAP BW (Business Warehouse) when the system is trying to optimize aggregates but cannot find any suitable aggregates to summarize. This can happen for several reasons, and understanding the cause is essential for finding a solution.
  Causes:
  
  No Aggregates Defined: The most straightforward reason is that there are no aggregates defined for the InfoCube or the query being executed.
  Incompatible Aggregates: The aggregates that exist may not be compatible with the query or the data being processed.
  Data Model Changes: Changes in the underlying data model (like changes in InfoObjects or InfoProviders) may lead to aggregates becoming invalid or unusable.
  Data Not Loaded: If the data has not been loaded into the aggregates, the system will not be able to summarize them.
  Incorrect Settings: The settings for the aggregates may not be configured correctly, leading to issues in summarization.
  
  Solutions:
  
  Check Aggregate Definitions: Verify that aggregates are defined for the InfoCube in question. If not, create the necessary aggregates.
  Rebuild Aggregates: If aggregates exist but are not functioning correctly, consider rebuilding them. This can be done through the SAP BW administration tools.
  Validate Data Loading: Ensure that data has been successfully loaded into the aggregates. If not, perform the necessary data loads.
  Review Query Settings: Check the query settings to ensure that they are compatible with the aggregates. Sometimes, filters or characteristics in the query may prevent the use of certain aggregates.
  Analyze Data Model Changes: If there have been recent changes to the data model, review those changes to ensure they do not affect the aggregates.
  Check for Errors in the Process Chain: If aggregates are part of a process chain, ensure that there are no errors in the process chain that could affect the aggregates.
  
  Related Information:
  
  Transaction Codes: You can use transaction codes like RSA1 (Data Warehousing Workbench) to manage aggregates and check their status.
  Performance Tuning: Regularly monitor and tune the performance of your BW system, as aggregates play a crucial role in query performance.
  SAP Notes: Check for any relevant SAP Notes that may address specific issues related to aggregates and optimization.
  Documentation: Refer to SAP documentation for best practices on managing aggregates and optimizing performance in SAP BW.
  
  By following these steps, you should be able to identify the cause of the RSDD020 error and implement a solution to resolve it.