How To Fix GT021 - System error (enqueue processing not anticipated)

SAP Error Message - Details

• Message type: E = Error

• Message class: GT - Database utilities

• Message number: 021

• Message text: System error (enqueue processing not anticipated)

What causes this issue?

The editing of lock objects is not supported.

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?

The action cannot be executed for lock objects.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message GT021 - System error (enqueue processing not anticipated) ?

  The SAP error message GT021, which states "System error (enqueue processing not anticipated)," typically indicates an issue related to the enqueue mechanism in SAP. This mechanism is responsible for managing locks on objects in the system to ensure data consistency during concurrent access.
  Causes:
  
  Lock Table Issues: The enqueue lock table may be full or corrupted, leading to issues when trying to acquire locks.
  System Resource Limitations: Insufficient system resources (like memory or CPU) can lead to problems with enqueue processing.
  Database Issues: Problems with the underlying database, such as connection issues or transaction log problems, can also trigger this error.
  Configuration Errors: Incorrect configuration settings in the SAP system or the database can lead to enqueue processing errors.
  Software Bugs: There may be bugs in the SAP kernel or related components that cause unexpected behavior during enqueue processing.
  
  Solutions:
  
  Check Lock Table: Use transaction code SM12 to check for locks. If the lock table is full, you may need to increase its size or clear unnecessary locks.
  Monitor System Resources: Use transaction codes like SM50 or SM66 to monitor system performance and resource usage. Ensure that the system has adequate resources.
  Check Database Connections: Verify that the database is running correctly and that there are no connection issues. Check the database logs for any errors.
  Review Configuration: Ensure that the configuration settings for the enqueue server and database are correct. This includes checking parameters in the instance profile.
  Kernel Upgrade: If the issue persists, consider upgrading the SAP kernel to the latest version, as it may contain fixes for known bugs.
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may address this specific error. There may be patches or recommendations available.
  Restart Enqueue Server: In some cases, restarting the enqueue server can resolve temporary issues.
  
  Related Information:
  
  
  Transaction Codes: 
  
  SM12: Display and manage locks.
  SM21: Check system logs for errors.
  SM50 / SM66: Monitor work processes.
  SMD1: Check enqueue server status.
  
  
  
  SAP Support: If the issue cannot be resolved with the above steps, consider reaching out to SAP Support for further assistance. Provide them with detailed logs and system information to help diagnose the problem.
  
  
  Documentation: Review SAP documentation related to enqueue processing and locking mechanisms for a deeper understanding of how these systems work.
  
  
  By following these steps, you should be able to diagnose and potentially resolve the GT021 error in your SAP system.