How To Fix GT326 - Operation performed despite DDL lock

SAP Error Message - Details

• Message type: E = Error

• Message class: GT - Database utilities

• Message number: 326

• Message text: Operation performed despite DDL lock

What causes this issue?

Table D0GEN contains an entry that represents a lock for DDL
statements. This lock is normally set by program tp. DDPROF also
contains an entry saying that this lock should be ignored.

System Response

The requested operation is executed despite the lock.

How to fix this error?

Please read Note 102069 or the section about "tp impsync" in the
documentation on program tp.

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 GT326 - Operation performed despite DDL lock ?

  The SAP error message GT326, which states "Operation performed despite DDL lock," typically occurs when a Data Definition Language (DDL) operation is attempted on a database object that is currently locked by another transaction. This can happen in various scenarios, such as when multiple users or processes are trying to modify the same database object simultaneously.
  Cause:
  
  DDL Locking: DDL operations (like creating, altering, or dropping tables) acquire locks on the database objects. If another transaction is holding a lock on the same object, the DDL operation may still proceed, but it can lead to inconsistencies or unexpected behavior.
  Long-Running Transactions: If a transaction is taking a long time to complete, it may hold locks longer than expected, causing other operations to be blocked.
  Concurrent Access: Multiple users or processes trying to access or modify the same database object at the same time can lead to DDL locks.
  
  Solution:
  
  Identify the Locking Transaction: Use transaction codes like SM12 (to view lock entries) or SM21 (to check the system log) to identify which transaction is holding the lock.
  Wait for Completion: If possible, wait for the locking transaction to complete. This is often the simplest solution.
  Terminate the Locking Transaction: If the locking transaction is not completing and is causing issues, you may need to terminate it. This can be done using transaction SM50 (to view and manage processes) or SM66 (to view processes across the system).
  Optimize Long-Running Transactions: Review and optimize any long-running transactions to minimize the time they hold locks.
  Review Application Logic: Ensure that your application logic is designed to handle concurrent access properly, possibly by implementing retry mechanisms or using appropriate isolation levels.
  
  Related Information:
  
  Database Documentation: Check the documentation for your specific database (e.g., Oracle, SQL Server, HANA) for details on how DDL locks are managed.
  SAP Notes: Search for relevant SAP Notes in the SAP Support Portal that may provide additional insights or patches related to this error.
  Performance Monitoring: Use performance monitoring tools to analyze the workload and identify potential bottlenecks in your system.
  
  If the issue persists after trying the above solutions, consider reaching out to SAP support for further assistance, providing them with detailed logs and information about the circumstances under which the error occurs.