How To Fix DB6121 - Number of lock timeouts per hour

DB6121 - Overview

• Message type: E = Error

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

• Message number: 121

• Message text: Number of lock timeouts per hour

What causes this issue?

You can set the time that an application waits for a lock in the
database configuration parameter LOCKTIMEOUT. After this wait time
expires, the system resets the waiting transaction.

System Response

Resetting a transaction is performance-critical. The actual cause of
the problem is often an application problem, in that an application
locks for too long.

How to fix this error?

We recommend the following procedure:
Identify the applications that hold the locks.
If the parameter LOCKTIMEOUT is too small, adjust it.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DB6121 - Number of lock timeouts per hour ?

  The SAP error message DB6121 indicates that the number of lock timeouts per hour has exceeded a predefined threshold. This typically occurs in environments where multiple transactions are trying to access the same database records simultaneously, leading to contention and lock timeouts.
  
  Cause:
  
  High Concurrency: Multiple users or processes are trying to access the same data simultaneously, leading to lock contention.
  Long-Running Transactions: Transactions that take a long time to complete can hold locks for extended periods, increasing the likelihood of timeouts for other transactions.
  Inefficient Queries: Poorly optimized queries can lead to longer execution times, which can exacerbate locking issues.
  Database Configuration: The database settings for lock timeouts may be too low for the workload being processed.
  Application Logic: Inefficient application logic that leads to unnecessary locking or delays in releasing locks.
  
  
  Solution:
  
  Analyze Lock Contention: Use transaction monitoring tools to identify which transactions are causing lock contention. Tools like SAP's transaction SM12 (for lock entries) and