How To Fix DB6PM843 - No non-existing index is recommended.

SAP Error Message - Details

• Message type: E = Error

• Message class: DB6PM - DB2 UDB for UNIX, Windows: Performance Monitoring

• Message number: 843

• Message text: No non-existing index is recommended.

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

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Smart SAP Assistant

• What is the cause and solution for SAP error message DB6PM843 - No non-existing index is recommended. ?

  The SAP error message DB6PM843 indicates that the database system is unable to recommend a non-existing index for a specific query or operation. This typically occurs when the database optimizer is trying to find an optimal execution plan for a query but cannot suggest an index that would improve performance because the required index does not exist.
  Causes:
  
  Missing Index: The most common cause is that the query being executed would benefit from an index that has not been created in the database.
  Suboptimal Query Design: The query itself may not be written in a way that allows the optimizer to effectively utilize existing indexes.
  Database Statistics: Outdated or missing statistics can lead the optimizer to make poor decisions regarding index usage.
  Database Configuration: Certain configurations or settings in the database may prevent the optimizer from recommending indexes.
  
  Solutions:
  
  
  Create Missing Indexes:
  
  Analyze the query and determine which columns are being used in WHERE clauses, JOIN conditions, or ORDER BY clauses.
  Create the necessary indexes on those columns to improve query performance.
  
  
  
  Optimize Queries:
  
  Review the SQL query for potential optimizations. This may include rewriting the query to make better use of existing indexes or simplifying complex joins.
  
  
  
  Update Database Statistics:
  
  Ensure that the database statistics are up to date. This can often be done using commands like ANALYZE or UPDATE STATISTICS, depending on the database system in use.
  
  
  
  Review Database Configuration:
  
  Check the database configuration settings to ensure that the optimizer is functioning correctly and is not restricted in its ability to recommend indexes.
  
  
  
  Use Database Tools:
  
  Utilize database performance analysis tools or SAP's own tools to analyze query performance and get recommendations for indexes.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific recommendations or patches related to this error message.
  Database Documentation: Refer to the documentation for the specific database system (e.g., Oracle, SQL Server, HANA) for best practices on indexing and query optimization.
  Performance Monitoring: Regularly monitor database performance and query execution plans to identify potential issues before they become critical.
  
  By addressing the underlying causes of the error, you can improve the performance of your SAP system and reduce the occurrence of this error message.