How To Fix NGC_CORE_DB006 - Table &1 cannot be locked: already locked

SAP Error Message - Details

• Message type: E = Error

• Message class: NGC_CORE_DB - Message class for Conversion reports

• Message number: 006

• Message text: Table &1 cannot be locked: already locked

What causes this issue?

Table &V1& cannot be locked: already locked.

System Response

The conversion is aborted.

How to fix this error?

Unlock the table (other applications are locking it at the moment) and
run the conversion again.

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 NGC_CORE_DB006 - Table &1 cannot be locked: already locked ?

  The SAP error message NGC_CORE_DB006 indicates that a specific database table (denoted by &1) cannot be locked because it is already locked by another process. This situation typically arises in environments where multiple users or processes are trying to access or modify the same data concurrently.
  Causes:
  
  Concurrent Access: Another transaction or user is currently accessing the table, which prevents your transaction from obtaining a lock.
  Long-Running Transactions: A transaction that takes a long time to complete may hold a lock on the table longer than expected.
  Deadlocks: In some cases, a deadlock situation may occur where two or more processes are waiting for each other to release locks.
  Database Configuration: Certain database configurations or settings may lead to locking issues, especially in high-concurrency environments.
  
  Solutions:
  
  Wait and Retry: If the lock is temporary, waiting for a few moments and then retrying the operation may resolve the issue.
  Identify the Locking Process: Use transaction codes like SM12 (for lock entries) to identify which user or process is holding the lock on the table. You can then decide whether to wait for it to complete or take action.
  Terminate the Locking Process: If you have the necessary permissions and it is safe to do so, you can terminate the process that is holding the lock. This can be done through transaction SM66 (global overview of processes) or SM12.
  Optimize Transactions: Review and optimize the transactions that are accessing the table to ensure they complete quickly and release locks promptly.
  Database Configuration Review: Consult with your database administrator to review the database configuration and locking mechanisms to ensure they are optimized for your workload.
  
  Related Information:
  
  
  Transaction Codes:
  
  SM12: Display and manage lock entries.
  SM66: Global overview of processes.
  ST22: Dump analysis, in case of ABAP runtime errors.
  SM21: System log, to check for any related errors or warnings.
  
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to locking mechanisms in your specific version of SAP.
  
  
  Performance Monitoring: Regularly monitor system performance and locking behavior to proactively address potential issues before they impact users.
  
  
  If the problem persists after trying the above solutions, it may be beneficial to consult with SAP support or your internal SAP Basis team for further assistance.