How To Fix R7691 - Secondary index for table &1 has been deleted; not required for high card

SAP Error Message - Details

• Message type: E = Error

• Message class: R7 - BW: Data basis

• Message number: 691

• Message text: Secondary index for table &1 has been deleted; not required for high card

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message R7691 - Secondary index for table &1 has been deleted; not required for high card ?

  The SAP error message R7691 indicates that a secondary index for a database table has been deleted because it is not required for high cardinality. This typically occurs when the database optimizer determines that the secondary index is not beneficial for performance due to the nature of the data in the table.
  Cause:
  
  High Cardinality: The table in question has a high cardinality, meaning that the number of distinct values in the indexed column(s) is very high. In such cases, the database optimizer may decide that maintaining a secondary index is not necessary or beneficial for query performance.
  Index Usage: The secondary index may not have been used frequently enough to justify its existence, leading to its deletion.
  Database Optimization: The database system may automatically manage indexes based on usage patterns and performance metrics, leading to the removal of indexes that are deemed unnecessary.
  
  Solution:
  
  Review Index Usage: Check the usage statistics of the secondary index to understand why it was deleted. You can use transaction codes like ST04 (Performance Analysis) or ST12 (Single Transaction Analysis) to analyze index usage.
  Recreate the Index: If you determine that the secondary index is still needed for specific queries, you can recreate it manually using the Data Dictionary (SE11) or through SQL commands.
  Optimize Queries: If the index is not needed, consider optimizing the queries that were relying on it. This may involve rewriting queries to use primary keys or other existing indexes.
  Database Maintenance: Regularly perform database maintenance tasks, such as updating statistics and reorganizing tables, to ensure optimal performance and index management.
  Consult Documentation: Refer to SAP documentation or consult with your database administrator for best practices regarding index management and performance tuning.
  
  Related Information:
  
  Transaction Codes: Use transaction codes like SE11 (Data Dictionary), SE14 (Database Utility), and ST04 (Performance Analysis) for managing and analyzing database objects.
  SAP Notes: Check SAP Notes for any specific guidance or updates related to this error message.
  Database Documentation: Review the documentation for your specific database (e.g., HANA, Oracle, SQL Server) for best practices on index management and performance tuning.
  
  By following these steps, you can address the R7691 error message and ensure that your database performance remains optimal.