How To Fix 5D266 - Error locking table & with key & & &

SAP Error Message - Details

• Message type: E = Error

• Message class: 5D - Error Messages for German Infotype Module Pools

• Message number: 266

• Message text: Error locking table & with key & & &

What causes this issue?

An error ocurred when locking table &V1& with the key &V2& &V3& &V4&.

System Response

The operation cannot be carried out.

How to fix this error?

Check your entries and the available lock entries concerning this
table. If necessary, inform your system administrator.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message 5D266 - Error locking table & with key & & & ?

  The SAP error message 5D266, which indicates an issue with locking a table, typically arises in scenarios where multiple processes or users are trying to access or modify the same data concurrently. This can lead to contention for database locks, resulting in the error message.
  Cause:
  
  Concurrent Access: Multiple users or processes are trying to access or modify the same table or record simultaneously.
  Long-Running Transactions: A transaction that takes a long time to complete can hold locks longer than necessary, causing other transactions to wait.
  Deadlocks: Situations where two or more transactions are waiting for each other to release locks, leading to a deadlock.
  Database Configuration: Issues with the database configuration or lock settings can also lead to this error.
  
  Solution:
  
  Identify the Lock: Use transaction codes like SM12 (to view and manage locks) to identify which user or process is holding the lock.
  Release Locks: If a lock is held unnecessarily, you can manually release it using SM12. However, be cautious when doing this, as it may lead to data inconsistency.
  Optimize Transactions: Review and optimize long-running transactions to ensure they complete quickly and release locks promptly.
  Increase Lock Timeout: If appropriate, consider increasing the lock timeout settings in the database configuration to allow longer wait times for locks.
  Avoid Deadlocks: Review the application logic to ensure that transactions are designed to avoid deadlocks. This may involve changing the order of operations or implementing retry logic.
  Monitor System Performance: Regularly monitor system performance and lock contention to identify and address potential issues proactively.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM21 (system log), SM37 (job monitoring), and ST22 (dump analysis) to gather more information about the context of the error.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP frequently updates its knowledge base with solutions for common problems.
  Database Logs: Review database logs for any additional information that may help diagnose the locking issue.
  
  If the problem 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.