How To Fix LTR2_BASIS021 - Unexpected error during locking &1 in exclusive mode

SAP Error Message - Details

• Message type: E = Error

• Message class: LTR2_BASIS - LTR2 Basis Messages

• Message number: 021

• Message text: Unexpected error during locking &1 in exclusive mode

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 LTR2_BASIS021 - Unexpected error during locking &1 in exclusive mode ?

  The SAP error message LTR2_BASIS021 indicates that there was an unexpected error during the locking of an object in exclusive mode. This typically occurs in the context of database operations where a lock is required to ensure data integrity during transactions.
  Causes:
  
  Database Lock Conflicts: Another process may already hold a lock on the object you are trying to access, leading to a conflict.
  System Resource Issues: Insufficient system resources (like memory or CPU) can lead to unexpected errors during locking.
  Database Corruption: There may be underlying issues with the database that are causing the locking mechanism to fail.
  Configuration Issues: Incorrect configuration settings in the SAP system or database can lead to locking issues.
  Network Issues: If the SAP system is unable to communicate with the database server properly, it may lead to locking errors.
  
  Solutions:
  
  Check Lock Entries: Use transaction code SM12 to check for existing lock entries. If you find locks that are no longer needed, you can delete them (ensure that you have the necessary authorizations).
  Review System Logs: Check the system logs (transaction code SM21) for any related error messages that might provide more context about the issue.
  Database Health Check: Perform a health check on the database to ensure there are no corruption issues. This may involve running database-specific tools or commands.
  Restart the Application Server: Sometimes, restarting the application server can clear transient issues that may be causing the locking error.
  Increase System Resources: If the issue is related to resource constraints, consider increasing the available memory or CPU resources for the SAP application server.
  Consult SAP Notes: Check the SAP Support Portal for any relevant SAP Notes that may address this specific error message or provide patches or updates.
  Contact SAP Support: If the issue persists and you cannot identify the cause, it may be necessary to contact SAP Support for further assistance.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with transaction codes like SM12 (for lock entries), SM21 (for system logs), and ST22 (for dumps) to diagnose issues.
  SAP Basis Team: Involve your SAP Basis team, as they can provide insights into system performance and configuration.
  Documentation: Review SAP documentation related to locking mechanisms and database operations for a deeper understanding of how locks are managed in SAP systems.
  
  By following these steps, you should be able to diagnose and resolve the issue related to the LTR2_BASIS021 error message.