How To Fix DB6625 - Current lock list usage

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 625

• Message text: Current lock list usage

What causes this issue?

Instead of monitoring the upper limits, the system monitors here the
current lock list fill level. (LOCK LIST)

System Response

If the lock list overflows, transactions terminate.

How to fix this error?

If an error occurs, increase the size of the lock list using:
<LB>UPDATE DB CFG USING LOCKLIST <value></>
You could also change the transaction that caused the error.

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 DB6625 - Current lock list usage ?

  The SAP error message DB6625 indicates that the current lock list usage has reached a critical threshold. This message is typically related to database locking mechanisms, which are essential for maintaining data integrity in a multi-user environment. When the lock list is full, it can lead to issues such as transaction failures or performance degradation.
  Cause:
  
  High Concurrency: A large number of concurrent transactions trying to access the same data can lead to an increased number of locks being held.
  Long-Running Transactions: Transactions that take a long time to complete can hold locks for extended periods, preventing other transactions from acquiring the necessary locks.
  Inefficient Lock Management: Poorly designed applications or queries that do not release locks promptly can contribute to lock list saturation.
  Configuration Issues: The lock list size may be set too low for the workload being processed.
  
  Solution:
  
  Increase Lock List Size: If the lock list size is too small, consider increasing it. This can typically be done in the database configuration settings.
  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 underlying queries.
  Monitor Lock Usage: Use monitoring tools to analyze lock usage patterns and identify transactions that are holding locks for too long.
  Implement Lock Timeout: Set a lock timeout to prevent transactions from waiting indefinitely for locks, which can help in managing lock contention.
  Review Application Logic: Ensure that the application logic is designed to minimize lock contention, such as by accessing data in a consistent order or using appropriate isolation levels.
  Database Maintenance: Regularly perform database maintenance tasks, such as updating statistics and rebuilding indexes, to improve overall performance.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific recommendations or patches related to this error message.
  Transaction Codes: Use transaction codes like SM12 (to view and manage locks) and SM21 (to check system logs) for further analysis.
  Database Documentation: Refer to the documentation for your specific database (e.g., Oracle, SQL Server, HANA) for details on lock management and configuration settings.
  
  By addressing the underlying causes and implementing the suggested solutions, you can mitigate the occurrence of the DB6625 error and improve the overall performance of your SAP system.