How To Fix D4517 - Total number of rows read by table scans

SAP Error Message - Details

• Message type: E = Error

• Message class: D4 - DB2/400 specific messages

• Message number: 517

• Message text: Total number of rows read by table scans

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message D4517 - Total number of rows read by table scans ?

  The SAP error message D4517, which states "Total number of rows read by table scans," typically indicates that a certain threshold of rows has been read from database tables during a query execution. This message is often related to performance issues, as reading a large number of rows can lead to slower query execution times and increased resource consumption.
  Cause:
  
  Inefficient Queries: The SQL queries being executed may not be optimized, leading to full table scans instead of using indexes.
  Lack of Indexes: The relevant database tables may not have appropriate indexes, causing the database to read all rows to find the required data.
  Data Volume: The volume of data in the tables may be large, and the queries are not filtering the data effectively.
  Database Configuration: There may be configuration issues with the database that affect how queries are executed.
  
  Solution:
  
  
  Optimize SQL Queries: Review and optimize the SQL queries to ensure they are efficient. This may involve:
  
  Adding WHERE clauses to filter data.
  Using JOINs effectively to limit the number of rows processed.
  Avoiding SELECT * and specifying only the necessary columns.
  
  
  
  Create/Update Indexes: Analyze the database schema and create or update indexes on columns that are frequently used in WHERE clauses or JOIN conditions.
  
  
  Analyze Execution Plans: Use database tools to analyze the execution plans of the queries to identify bottlenecks and areas for improvement.
  
  
  Database Maintenance: Regularly perform database maintenance tasks such as updating statistics, rebuilding indexes, and cleaning up obsolete data.
  
  
  Monitor Performance: Use monitoring tools to track query performance and identify queries that consistently read a high number of rows.
  
  
  Consult Documentation: Refer to SAP documentation and best practices for performance tuning specific to your version and configuration.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Database Documentation: Review the documentation for the specific database you are using (e.g., HANA, Oracle, SQL Server) for performance tuning guidelines.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have implemented.
  
  By addressing the underlying causes of the D4517 error, you can improve the performance of your SAP system and reduce the number of rows read during table scans.