How To Fix S1821 - No valid refresh of DB Optimizer Statistics

SAP Error Message - Details

• Message type: E = Error

• Message class: S1 - Statistik / SAP-Monitor

• Message number: 821

• Message text: No valid refresh of DB Optimizer Statistics

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message S1821 - No valid refresh of DB Optimizer Statistics ?

  The SAP error message S1821, which states "No valid refresh of DB Optimizer Statistics," typically indicates that the database optimizer statistics are outdated or invalid. This can lead to suboptimal query performance because the database optimizer relies on these statistics to create efficient execution plans for SQL queries.
  Causes:
  
  Outdated Statistics: The statistics for the database tables may not have been updated for a long time, leading to inaccurate data about the distribution of data within the tables.
  Database Changes: Significant changes in the data, such as bulk inserts, updates, or deletions, can render existing statistics obsolete.
  Configuration Issues: There may be issues with the configuration of the database or the SAP system that prevent the automatic update of statistics.
  Database Maintenance: Lack of regular database maintenance tasks, such as running the statistics update jobs.
  
  Solutions:
  
  
  Update Statistics Manually: You can manually trigger the update of the database statistics. This can usually be done through the database management tools or SQL commands specific to your database system (e.g., ANALYZE TABLE for Oracle, UPDATE STATISTICS for SQL Server).
  
  
  Schedule Regular Updates: Set up a regular job to update the statistics automatically. This can be done using database-specific scheduling tools or through SAP's background job scheduling.
  
  
  Check Configuration: Ensure that the database and SAP system are configured correctly to allow for automatic statistics updates. This may involve checking parameters related to statistics collection in the database.
  
  
  Monitor Database Performance: Regularly monitor the performance of the database and the execution plans of queries to identify when statistics need to be updated.
  
  
  Consult Documentation: Refer to the documentation for your specific database system and SAP version for best practices on managing and updating statistics.
  
  
  Related Information:
  
  Database-Specific Commands: Familiarize yourself with the commands and procedures for updating statistics in your specific database (e.g., Oracle, SQL Server, HANA).
  SAP Notes: Check SAP Notes related to performance tuning and database maintenance for additional guidance and best practices.
  Performance Monitoring Tools: Utilize performance monitoring tools provided by SAP or third-party solutions to keep track of database performance and identify when statistics need to be refreshed.
  
  By addressing the underlying causes and implementing regular maintenance practices, you can resolve the S1821 error and improve the performance of your SAP system.