How To Fix GT324 - DDL lock set by tp (D0GEN)

SAP Error Message - Details

• Message type: E = Error

• Message class: GT - Database utilities

• Message number: 324

• Message text: DDL lock set by tp (D0GEN)

What causes this issue?

An entry that represents a lock for DDL statements was found in table
D0GEN. This lock is normally set by program tp.

System Response

The request is not executed because it also results in DDL statements.

How to fix this error?

Please read Note 102069 or the section about "tp impsync" in the
documentation for 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 GT324 - DDL lock set by tp (D0GEN) ?

  The SAP error message GT324, which indicates a "DDL lock set by tp (D0GEN)," typically occurs during database operations when a Data Definition Language (DDL) statement is trying to access a database object that is currently locked by another process. This can happen during transport operations, especially when multiple transports are being executed simultaneously or when a long-running DDL operation is in progress.
  Cause:
  
  Concurrent DDL Operations: Multiple DDL statements trying to access the same database object at the same time can lead to locks.
  Long-Running Transactions: A transaction that takes a long time to complete can hold a lock on a database object, preventing other operations from proceeding.
  Transport Layer Issues: If the transport process (tp) is trying to execute a DDL operation while another transport or database operation is still in progress, it can lead to this error.
  
  Solution:
  
  Wait and Retry: Often, the simplest solution is to wait for the current DDL operation to complete and then retry the transport operation.
  Check for Long-Running Transactions: Use database monitoring tools to identify any long-running transactions that may be holding locks. If possible, terminate or optimize these transactions.
  Sequential Transport Execution: If multiple transports are being executed simultaneously, consider running them sequentially to avoid conflicts.
  Database Lock Monitoring: Use database-specific tools or SQL queries to check for locks and identify the processes that are holding them. For example, in Oracle, you can query the v$lock and v$session views.
  Transport Directory Cleanup: Ensure that the transport directory is clean and that there are no leftover locks from previous transport operations.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide patches or updates that could resolve underlying issues.
  
  Related Information:
  
  SAP Basis Administration: Understanding how to manage transports and database operations is crucial for SAP Basis administrators.
  Database Locking Mechanisms: Familiarity with how your specific database (e.g., Oracle, SQL Server, HANA) handles locks can help in troubleshooting.
  SAP Transport Management System (TMS): Knowledge of TMS configuration and operation can help in managing transport requests effectively.
  Monitoring Tools: Utilize SAP transaction codes like SM12 (to view locks) and SM21 (to check system logs) for monitoring and troubleshooting.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with your SAP Basis team or reach out to SAP support for further assistance.