How To Fix D3149 - The explain function is already in use

SAP Error Message - Details

• Message type: E = Error

• Message class: D3 - CCMS - DB2 on OS390

• Message number: 149

• Message text: The explain function is already in use

What causes this issue?

You want to explain a SQL statement.

System Response

The explain function is currently being used by another user and is
therefore locked (by an ENQUEUE lock).

How to fix this error?

Wait until the other user has finished.
If the ENQUEUE lock remains as a result of a mode termination or due to
other serious problems in the lock administration, and no other user is
editing the object, you can delete the lock using Transaction SM12.
This operation is logged by the system.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message D3149 - The explain function is already in use ?

  The SAP error message D3149, which states "The explain function is already in use," typically occurs when a user attempts to execute the EXPLAIN function in the SAP system while another EXPLAIN operation is already in progress. This can happen in various scenarios, such as when multiple users are trying to analyze the same SQL statement or when a long-running EXPLAIN operation is still being processed.
  Cause:
  
  Concurrent EXPLAIN Requests: Another user or session is already executing an EXPLAIN command on the same database object or SQL statement.
  Long-Running EXPLAIN: The previous EXPLAIN operation is taking longer than expected, causing subsequent requests to be blocked.
  Session Management: The system may not be properly managing sessions, leading to conflicts when multiple EXPLAIN requests are initiated.
  
  Solution:
  
  Wait and Retry: If you encounter this error, wait for a few moments and then try executing the EXPLAIN function again. The previous operation may complete, allowing you to proceed.
  Check Active Sessions: Use transaction codes like SM50 or SM66 to monitor active processes and see if there is an ongoing EXPLAIN operation. If you identify a long-running EXPLAIN, you may need to wait for it to finish.
  Terminate Long-Running Processes: If you have the necessary permissions and it is appropriate to do so, you can terminate the long-running EXPLAIN process using transaction SM50 or SM66.
  Review SQL Statements: If you frequently encounter this issue, consider reviewing the SQL statements you are analyzing. Optimizing them may reduce the time taken for the EXPLAIN operation.
  Consult Basis Team: If the problem persists, it may be beneficial to consult your SAP Basis team. They can check for any underlying issues with the database or system configuration that may be causing the conflict.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with transaction codes like SM50 (Process Overview) and SM66 (Global Process Overview) to monitor and manage active processes.
  Performance Tuning: Consider engaging in performance tuning of your SQL queries to minimize the time taken for EXPLAIN operations.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP frequently updates its knowledge base with solutions for common problems.
  
  By following these steps, you should be able to resolve the D3149 error and successfully use the EXPLAIN function in SAP.