How To Fix BRAIN016 - Query & now selects data on demand when navigating and expanding hierchs

SAP Error Message - Details

• Message type: E = Error

• Message class: BRAIN -

• Message number: 016

• Message text: Query & now selects data on demand when navigating and expanding hierchs

Query & now reads data on demand when navigating and expanding the
hierarchy.
For a query, the OLAP processor can read the data in the fact table in
one of three ways:
Reading all of the data
When executing the query in the Business Explorer all of the fact table
data, that is needed for all possible navigational steps in the query,
is read in the main memory area of the OLAP processor. Therefore, all
new navigational states are aggregated and calculated from the data of
the main memory.
Reading the data on demand:
The OLAP processor only requests the corresponding fact table data that
is needed for each navigational state of the query in the Business
Explorer. Therefore, new data is read for each navigational step. The
most suitable aggregate table is used and, if possible, already
aggregated on the database. The data for identical navigational states
states is buffered in the OLAP processor.
Reading on demand when expanding the hierarchy:
When reading data on demand (2), the data for the entire - meaning
completely expanded - hierarchy is requested for a hierarchy drilldown.
For the read on demand when expanding the hierarchy (3), the data is
aggregated by the database along the hierarchy and is sent to the start
level of the hierarchy (highest node) in the OLAP processor. When
expanding a hierarchy node, the children of the node are then
respectively read on demand.

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

In general, the reading of data on demand (2) provides much better
performance than reading all the data (1). This read mode should
especially be considered for queries with many, free characteristics. A
query that contains two or more free characteristics from different
dimensions (e.g. 'Customer' and 'Product'), will probably only be
efficiently executable in this mode, as the aggregates can only be
optimally used when reading the data on demand.
For large hierarchies, aggregates should be created a middle level of
the hierarchy and the start level of the query should be smaller or the
same as this aggregate level. For queries about such large hierarchies,
the read on demand when expanding the hierarchy method (3) should be
set.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message BRAIN016 - Query & now selects data on demand when navigating and expanding hierchs ?

  The SAP error message BRAIN016 typically indicates an issue related to the query execution in SAP BW (Business Warehouse) when navigating and expanding hierarchies in a query. This error can occur when the system is unable to fetch the required data on demand due to various reasons.
  Causes of BRAIN016 Error
  
  Data Source Issues: The underlying data source may not be properly configured or may not contain the necessary data.
  Hierarchy Configuration: The hierarchy might not be set up correctly, or there may be issues with the hierarchy nodes.
  Query Design: The query might have design flaws, such as incorrect filters or aggregations that prevent data retrieval.
  Performance Settings: The system may have performance settings that limit the amount of data fetched on demand.
  Authorization Issues: The user may not have the necessary authorizations to access certain data or hierarchies.
  System Performance: High load on the system or insufficient resources can lead to timeouts or failures in data retrieval.
  
  Solutions
  
  
  Check Data Source: Ensure that the data source is correctly configured and contains the necessary data. You can do this by running a data preview or checking the data in the InfoProvider.
  
  
  Review Hierarchy Configuration: Verify that the hierarchy is correctly set up. Check for any inconsistencies or missing nodes in the hierarchy.
  
  
  Query Design Review: Analyze the query design for any issues. Look for filters, variables, or aggregations that may be causing the problem. Simplifying the query can sometimes help.
  
  
  Adjust Performance Settings: If the system is configured to limit data retrieval, consider adjusting these settings. This may involve changing the settings in the query properties or the BW system settings.
  
  
  Check Authorizations: Ensure that the user has the necessary authorizations to access the data and hierarchies involved in the query.
  
  
  Monitor System Performance: Check the system performance and resource utilization. If the system is under heavy load, consider optimizing performance or scheduling data loads during off-peak hours.
  
  
  Update SAP Notes: Check for any relevant SAP Notes that may address this specific error. Sometimes, SAP releases patches or updates that resolve known issues.
  
  
  Consult Documentation: Refer to SAP documentation or community forums for additional insights or similar cases.
  
  
  Related Information
  
  SAP BW Documentation: Review the official SAP BW documentation for best practices in query design and hierarchy management.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  SAP Support: If the issue persists, consider reaching out to SAP Support for assistance, especially if it is impacting business operations.
  
  By following these steps, you should be able to diagnose and resolve the BRAIN016 error effectively.