How To Fix GT909 - Lock entry deleted

SAP Error Message - Details

• Message type: E = Error

• Message class: GT - Database utilities

• Message number: 909

• Message text: Lock entry deleted

What causes this issue?

If the conversion of a table is cancelled, a lock entry is written for
the table. This prevents another database operation being started
for the table until the old one has been completed correctly.
You have deleted an existing lock entry for the table. Please note that
if a database operation for the table is initiated, there is a danger
of data loss.

System Response

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

How to fix this error?

No action necessary.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message GT909 - Lock entry deleted ?

  The SAP error message GT909, 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you encounter this error, it usually indicates that a lock entry that was expected to be present has been deleted or is no longer valid.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 GT909 Error
  
  
  Session Timeout: The lock entry may have been deleted due to a session timeout. If a user is inactive for a certain period, the system may automatically release the locks held by that session.
  
  
  Explicit Unlocking: Another user or process may have explicitly released the lock, either intentionally or due to an error.
  
  
  System Restart or Crash: If the SAP system experiences a restart or crash, it may lead to the loss of lock entries.
  
  
  Lock Table Overflow: If the lock table is full, the system may delete older lock entries to make room for new ones.
  
  
  Database Issues: Problems with the underlying database can also lead to inconsistencies in lock management.
  
  
  Solutions to GT909 Error
  
  
  Retry the Operation: Often, simply retrying the operation can resolve the issue, especially if it was a temporary condition.
  
  
  Check Lock Entries: Use transaction code SM12 to check for existing lock entries. You can see if the lock you were trying to access is still valid or if it has been released.
  
  
  Increase Lock Table Size: If the issue is related to lock table overflow, consider increasing the size of the lock table. This can be done by adjusting the profile parameters in the SAP system.
  
  
  Session Management: Ensure that users are not leaving sessions idle for too long, which can lead to timeouts. Educate users on best practices for session management.
  
  
  System Monitoring: Regularly monitor the system for performance issues, crashes, or other anomalies that could affect lock management.
  
  
  Consult SAP Notes: Check the SAP Support Portal for any relevant notes or patches that may address this specific error.
  
  
  Contact SAP Support: If the issue persists and cannot be resolved through the above steps, consider reaching out to SAP Support for further assistance.
  
  
  Related Information
  
  
  Transaction Codes: 
  
  SM12: To view and manage lock entries.
  SM21: To check system logs for any related errors or warnings.
  ST22: To analyze dumps that may provide insight into the issue.
  
  
  
  SAP Documentation: Review SAP's official documentation on lock management and error handling for more detailed information.
  
  
  Performance Tuning: Regularly perform system health checks and tuning to ensure optimal performance and reduce the likelihood of such errors.
  
  
  By understanding the causes and solutions related to the GT909 error, you can take appropriate steps to mitigate its impact on your SAP environment.