How To Fix AD909 - Lock entry deleted

SAP Error Message - Details

• Message type: E = Error

• Message class: AD - Data Dictionary application messages

• Message number: 909

• Message text: Lock entry deleted

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.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message AD909 - Lock entry deleted ?

  The SAP error message AD909, which states "Lock entry deleted," typically occurs in the context of SAP's locking mechanism. This mechanism is used to prevent data inconsistencies by ensuring that multiple users or processes do not modify the same data simultaneously. When you encounter this error, it usually indicates that a lock entry that was expected to be present has been deleted or is no longer valid.
  Causes of AD909 Lock Entry Deleted
  
  Session Timeout: The lock may have been held by a session that timed out or was terminated unexpectedly.
  Manual Deletion: A user or process may have manually deleted the lock entry.
  System Restart: A system restart or a background job that cleans up locks may have removed the lock entry.
  Lock Table Overflow: If the lock table is full, older entries may be deleted to make room for new ones.
  Database Issues: Problems with the database or connectivity issues can also lead to unexpected lock deletions.
  
  Solutions to AD909 Lock Entry Deleted
  
  Retry the Operation: Often, simply retrying the operation that caused the error can resolve the issue, especially if it was a transient problem.
  Check Lock Entries: Use transaction code SM12 to check for existing lock entries. You can see if the lock you are trying to access is still present or if it has been deleted.
  Review System Logs: Check the system logs (transaction SM21) for any related errors or warnings that might provide more context about why the lock was deleted.
  Increase Lock Table Size: If the issue is related to lock table overflow, consider increasing the size of the lock table in the system profile parameters.
  Session Management: Ensure that sessions are managed properly and that users are not leaving sessions open for extended periods without activity.
  Consult Basis Team: If the issue persists, it may be necessary to consult your SAP Basis team for further investigation, especially if there are underlying system or database issues.
  
  Related Information
  
  
  Transaction Codes:
  
  SM12: To view and manage lock entries.
  SM21: To check system logs for errors.
  SM37: To monitor background jobs that may be affecting locks.
  
  
  
  SAP Notes: Check SAP Notes for any specific patches or updates related to locking mechanisms or known issues with the version of SAP you are using.
  
  
  Documentation: Review SAP documentation on locking mechanisms to understand how locks are managed and the implications of lock entries being deleted.
  
  
  By following these steps, you should be able to diagnose and resolve the AD909 error effectively.