How To Fix AQ634 - Table is already being used

SAP Error Message - Details

• Message type: E = Error

• Message class: AQ - Message texts for SAP Query

• Message number: 634

• Message text: Table is already being used

What causes this issue?

You have tried to add a table to the join that is already there. This
is only possible if you define an alias.

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?

Click on continue if you want to add the table again under an alias.
Choose "Re-enter" if you want to select another table.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AQ634 - Table is already being used ?

  The SAP error message AQ634, which states "Table is already being used," typically occurs when there is an attempt to perform an operation on a database table that is currently locked or in use by another process. This can happen in various scenarios, such as during data updates, table modifications, or when trying to access a table that is being used in a long-running transaction.
  Causes:
  
  Concurrent Access: Multiple users or processes are trying to access or modify the same table simultaneously.
  Long-Running Transactions: A transaction that is taking a long time to complete may hold a lock on the table, preventing other operations from proceeding.
  Database Locks: The database may have locks in place due to previous operations that have not yet been committed or rolled back.
  Background Jobs: Background jobs or batch processes that are running and accessing the same table can lead to this error.
  
  Solutions:
  
  Wait and Retry: If the error is due to concurrent access, waiting for a few moments and then retrying the operation may resolve the issue.
  Check for Locks: Use transaction codes like SM12 (for lock entries) to check if there are any active locks on the table. If you find locks that are no longer needed, you can delete them (if you have the necessary authorizations).
  Analyze Long-Running Transactions: Use transaction codes like SM50 or SM66 to monitor active processes and identify any long-running transactions that may be holding locks.
  Review Background Jobs: Check for any background jobs that may be accessing the table using transaction code SM37. If a job is taking too long, you may need to investigate or terminate it.
  Database Administration: If the issue persists, it may require intervention from a database administrator to analyze and resolve any underlying database locking issues.
  
  Related Information:
  
  
  Transaction Codes:
  
  SM12: Display and manage lock entries.
  SM50: Monitor active processes on the application server.
  SM66: Monitor active processes across all application servers.
  SM37: Monitor background jobs.
  
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. You can search the SAP Support Portal for relevant notes.
  
  
  Documentation: Review SAP documentation for best practices on managing database locks and concurrent access to ensure optimal performance and avoid such errors in the future.
  
  
  If the problem continues after trying the above solutions, it may be beneficial to consult with your SAP Basis team or SAP support for further assistance.