How To Fix DB6626 - The lock list contains too many locks

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 626

• Message text: The lock list contains too many locks

Copied from DB6 625

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 DB6626 - The lock list contains too many locks ?

  The SAP error message DB6626, which states "The lock list contains too many locks," typically occurs when the number of locks in the database exceeds the limit set for the lock table. This can lead to performance issues and may prevent users from acquiring new locks, which can disrupt normal operations.
  Cause:
  
  Excessive Locking: The application may be creating too many locks due to long-running transactions or inefficient locking mechanisms.
  Configuration Limits: The database configuration may have a low limit set for the maximum number of locks allowed.
  Deadlocks: If transactions are not properly managed, it can lead to deadlocks, which can increase the number of locks held.
  Long-running Transactions: Transactions that take a long time to complete can hold locks longer than necessary, leading to an accumulation of locks.
  
  Solution:
  
  
  Increase Lock Table Size: 
  
  You can increase the size of the lock table in the database configuration. This is often done by adjusting parameters in the database settings (e.g., max_locks in the database configuration).
  Consult your database documentation for specific parameters related to lock management.
  
  
  
  Optimize Transactions:
  
  Review and optimize the code to ensure that transactions are as short as possible. Avoid holding locks longer than necessary.
  Ensure that locks are released promptly after their use.
  
  
  
  Monitor Lock Usage:
  
  Use transaction codes like SM12 (Display Locks) to monitor the locks currently held in the system. This can help identify which transactions are holding locks for too long.
  Analyze the locking behavior of your applications to identify patterns that lead to excessive locking.
  
  
  
  Implement Lock Management Strategies:
  
  Consider implementing strategies such as optimistic locking, where locks are only acquired when necessary, or using application-level locking mechanisms to reduce the number of database locks.
  
  
  
  Database Maintenance:
  
  Regularly perform database maintenance tasks, such as clearing old locks and optimizing database performance, to ensure that the system runs efficiently.
  
  
  
  Consult SAP Notes:
  
  Check for any relevant SAP Notes that may provide additional guidance or patches related to this error.
  
  
  
  Related Information:
  
  Transaction Codes: 
  
  SM12: Display Locks
  SM21: System Log
  ST22: Dump Analysis
  
  
  Database-Specific Documentation: Depending on the database you are using (e.g., Oracle, SQL Server, HANA), refer to the specific documentation for managing locks and configuring lock parameters.
  SAP Community: Engage with the SAP Community forums for insights and solutions shared by other users who may have encountered similar issues.
  
  By addressing the underlying causes and implementing the suggested solutions, you can mitigate the occurrence of the DB6626 error and improve the overall performance of your SAP system.