How To Fix S1520 - B*-tree not available for & (Refresh analysis)

SAP Error Message - Details

• Message type: E = Error

• Message class: S1 - Statistik / SAP-Monitor

• Message number: 520

• Message text: B*-tree not available for & (Refresh analysis)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message S1520 - B*-tree not available for & (Refresh analysis) ?

  The SAP error message S1520, which states "B-tree not available for & (Refresh analysis)," typically occurs in the context of SAP BW (Business Warehouse) or SAP HANA when there is an issue with the B-tree structure that is used for data storage and retrieval. This error can arise during the refresh of data or when trying to analyze data in a query.
  Cause:
  
  Data Inconsistency: The B*-tree structure may be inconsistent or corrupted due to incomplete data loads or failed processes.
  Missing Data: The data that the B*-tree is supposed to reference may be missing or not properly indexed.
  System Issues: There may be underlying system issues, such as memory problems or database connectivity issues, that prevent the B*-tree from being accessed.
  Configuration Issues: Incorrect configuration settings in the data model or the InfoProvider can lead to this error.
  
  Solution:
  
  Check Data Load Status: Ensure that all data loads have completed successfully. If there are any failed loads, resolve those issues and reload the data.
  *Rebuild the B-tree*: You may need to rebuild the B-tree structure. This can often be done through the SAP BW transaction codes or tools that allow you to manage the InfoProvider.
  
  For example, you can use transaction RSA1 to access the Data Warehousing Workbench, navigate to the InfoProvider, and perform a "Manage" or "Rebuild" operation.
  
  
  Check for Missing Data: Verify that all necessary data is present in the underlying tables. If data is missing, you may need to reload or correct the data.
  Analyze and Correct Configuration: Review the configuration of the InfoProvider and ensure that it is set up correctly. Check for any inconsistencies in the data model.
  System Health Check: Perform a health check on the SAP system to ensure that there are no underlying issues affecting performance or data access.
  Consult Logs: Check the system logs for any additional error messages or warnings that could provide more context about the issue.
  
  Related Information:
  
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address this specific error or provide additional troubleshooting steps.
  Documentation: Review the SAP BW or SAP HANA documentation for best practices on data loading and B*-tree management.
  Community Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  
  If the problem persists after trying the above solutions, it may be necessary to contact SAP support for further assistance.