How To Fix DB6551 - Der LOCKTIMEOUT parameter value is in the valid range

SAP Error Message - Details

• Message type: E = Error

• Message class: DB6 - DB6: Alert Monitoring and Alert Configuration

• Message number: 551

• Message text: Der LOCKTIMEOUT parameter value is in the valid range

Copied from first and second paragraphs of DB6 550

What causes this issue?

To ensure that applications do not have to wait too long for locks, you
can set a maximum time using the database configuration parameter
LOCKTIMEOUT. Once this time has passed, the applications are reset.

System Response

If the value of this parameter is too low, the system may unnecessarily
reset applications. Several applications may synchronize using locks.
You should use this value to ensure that applications do not hold locks
too long blocking other applications.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DB6551 - Der LOCKTIMEOUT parameter value is in the valid range ?

  The SAP error message DB6551 indicates that the LOCKTIMEOUT parameter value is within the valid range, but it may not be set correctly for your specific use case or environment. This error typically arises in the context of database operations where locks are involved, and it suggests that the system is experiencing issues related to lock timeouts.
  Cause:
  
  Lock Contention: The error may occur when multiple transactions are trying to access the same resource, leading to contention. If one transaction holds a lock for too long, others may time out waiting for that lock to be released.
  Configuration Issues: The LOCKTIMEOUT parameter may be set to a value that is too low for the operations being performed, causing transactions to fail before they can complete.
  Long-Running Transactions: If there are transactions that take a long time to complete, they can hold locks longer than expected, leading to timeouts for other transactions.
  Database Performance: Poor database performance can exacerbate lock contention issues, leading to increased wait times for locks.
  
  Solution:
  
  Increase LOCKTIMEOUT Value: If the current LOCKTIMEOUT value is too low, consider increasing it to allow transactions more time to acquire the necessary locks.
  Optimize Transactions: Review and optimize long-running transactions to ensure they complete as quickly as possible. This may involve breaking them into smaller transactions or optimizing the queries being executed.
  Analyze Locking Behavior: Use database monitoring tools to analyze locking behavior and identify which transactions are causing contention. This can help in understanding the root cause of the issue.
  Database Configuration: Review the database configuration settings related to locking and timeouts. Ensure that they are set appropriately for your workload.
  Implement Retry Logic: In application code, implement retry logic for transactions that fail due to lock timeouts. This can help mitigate the impact of transient lock contention issues.
  Consult Documentation: Refer to the SAP documentation and your specific database documentation for guidance on configuring lock timeouts and handling lock contention.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional guidance on handling lock timeouts.
  Database Documentation: Review the documentation for the specific database you are using (e.g., HANA, Oracle, SQL Server) for best practices related to locking and transaction management.
  Performance Monitoring: Utilize performance monitoring tools to keep an eye on database performance and locking behavior, which can help in proactively identifying and resolving issues.
  
  By addressing the underlying causes of the lock timeouts and adjusting configurations as necessary, you can reduce the occurrence of the DB6551 error and improve overall system performance.