How To Fix DB6PM846 - Select indexes to be included before calling EXPLAIN

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 846

• Message text: Select indexes to be included before calling EXPLAIN

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DB6PM846 - Select indexes to be included before calling EXPLAIN ?

  The SAP error message DB6PM846 indicates that you need to select indexes to be included in the EXPLAIN operation before executing it. This error typically arises when you are trying to analyze a SQL statement's execution plan without specifying which indexes should be considered.
  Cause:
  The error occurs because the EXPLAIN command in SAP is designed to provide insights into how a SQL statement will be executed, including which indexes will be used. If no indexes are selected, the system cannot generate a meaningful execution plan, leading to this error.
  Solution:
  To resolve this error, you need to specify the indexes that should be included in the EXPLAIN operation. Here are the steps you can follow:
  
  
  Identify the SQL Statement: Determine which SQL statement you are trying to analyze.
  
  
  Select Indexes: Before calling the EXPLAIN command, you need to select the relevant indexes. This can usually be done through the database management tools or directly in the SQL command.
  
  
  Use the Correct Syntax: Ensure that you are using the correct syntax for the EXPLAIN command. The syntax may vary depending on the database system you are using (e.g., HANA, Oracle, SQL Server).
  
  
  Execute EXPLAIN: After selecting the indexes, execute the EXPLAIN command again.
  
  
  Related Information:
  
  Database Documentation: Refer to the documentation for your specific database system to understand how to select indexes and use the EXPLAIN command effectively.
  Performance Tuning: Understanding how indexes work and how they can affect query performance is crucial. Consider reviewing best practices for indexing and query optimization.
  SAP Notes: Check SAP Notes for any specific guidance or updates related to this error message, as there may be patches or recommendations from SAP.
  
  Example:
  If you are using a SQL statement like this:
  SELECT * FROM my_table WHERE my_column = 'value';
  You would need to ensure that you have an index on my_column and then run the EXPLAIN command like this:
  EXPLAIN SELECT * FROM my_table WHERE my_column = 'value' USING INDEX my_index;
  Make sure to replace my_index with the actual name of the index you want to include in the EXPLAIN operation.
  By following these steps, you should be able to resolve the DB6PM846 error and successfully analyze your SQL statement's execution plan.