How To Fix RSDD746 - The block characteristic is NOT in the aggregate. Performance warning

SAP Error Message - Details

• Message type: E = Error

• Message class: RSDD - Message class for data manager

• Message number: 746

• Message text: The block characteristic is NOT in the aggregate. Performance warning

What causes this issue?

The block characteristic is NOT in the aggregate, because the BLOCKSIZE
is so small that no characteristic was found in the aggregate that has
enough instances to form enough blocks. As a consequence, the technical
characteristic CHANGEID is used to write "artificial" blocks into the F
table of the aggregate. These then have to be compressed. If they are
not compressed, the read performance for this aggregate is reduced.
Try a larger value for BLOCKSIZE or change the aggregate definition so
that a smaller aggregate can also be used (clever use of the aggregate
tree!).

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

System Response

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 RSDD746 - The block characteristic is NOT in the aggregate. Performance warning ?

  The SAP error message RSDD746, which states "The block characteristic is NOT in the aggregate. Performance warning," typically occurs in the context of SAP BW (Business Warehouse) when you are working with aggregates in your InfoCubes or when executing queries that involve aggregates.
  Cause:
  This warning indicates that a characteristic used in a query or report is not included in the aggregate that is being accessed. When a characteristic is not part of the aggregate, the system may need to access the detailed data in the InfoCube instead of the pre-aggregated data, which can lead to performance issues. This can happen due to:
  
  Missing Characteristics in Aggregate: The characteristic in question was not included when the aggregate was created.
  Changes in the Data Model: If the data model has changed (e.g., new characteristics added), the existing aggregates may not reflect these changes.
  Query Design: The query may be designed in such a way that it requires characteristics that are not part of the aggregate.
  
  Solution:
  To resolve this warning and improve performance, you can take the following steps:
  
  
  Check Aggregate Definition:
  
  Go to the aggregate definition in the SAP BW system and verify if the characteristic mentioned in the warning is included in the aggregate.
  If it is not included, consider adding it to the aggregate.
  
  
  
  Rebuild the Aggregate:
  
  If you have made changes to the InfoCube or the characteristics, you may need to rebuild the aggregate to include the new characteristics.
  Use transaction code RSA1 to access the Data Warehousing Workbench, navigate to the InfoCube, and manage aggregates.
  
  
  
  Optimize Query Design:
  
  Review the query design in the BEx Query Designer. If possible, modify the query to use characteristics that are included in the aggregate.
  This may involve changing the layout or filters applied in the query.
  
  
  
  Analyze Performance:
  
  After making changes, run performance analysis on the query to ensure that it is utilizing the aggregates effectively.
  Use transaction RSRT to analyze query performance and check if the aggregates are being used.
  
  
  
  Documentation and Best Practices:
  
  Document any changes made to aggregates and queries for future reference.
  Follow best practices for designing aggregates and queries to minimize performance issues.
  
  
  
  Related Information:
  
  Transaction Codes: 
  
  RSA1: Data Warehousing Workbench
  RSRT: Query Monitor
  
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or solutions related to this warning.
  Performance Tuning: Consider engaging in performance tuning practices for your BW system, including regular monitoring and maintenance of aggregates.
  
  By addressing the cause of the warning and implementing the suggested solutions, you can improve the performance of your SAP BW queries and reduce the occurrence of this warning message.