How To Fix DB6122 - Too many lock timeouts occur in the system

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 122

• Message text: Too many lock timeouts occur in the system

(Copy of DB6 121)

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 DB6122 - Too many lock timeouts occur in the system ?

  The SAP error message DB6122, which indicates "Too many lock timeouts occur in the system," typically arises when there are contention issues in the database due to locks. This can happen when multiple transactions are trying to access the same data simultaneously, leading to lock timeouts.
  Causes:
  
  High Concurrency: Multiple users or processes trying to access the same data at the same time can lead 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 SQL queries can lead to longer execution times and increased lock durations.
  Database Configuration: Inadequate database settings for handling locks and transactions can exacerbate the issue.
  Deadlocks: Situations where two or more transactions are waiting for each other to release locks can lead to timeouts.
  
  Solutions:
  
  Analyze Lock Contention: Use transaction codes like SM12 (to view locks) and SM21 (to check system logs) to identify which transactions are causing lock contention.
  Optimize Transactions: Review and optimize long-running transactions to ensure they complete as quickly as possible. This may involve breaking them into smaller units of work.
  Improve SQL Queries: Analyze and optimize SQL queries to reduce execution time and lock duration. Use tools like the SQL Trace (ST05) to identify slow queries.
  Increase Lock Timeout Settings: If appropriate, consider increasing the lock timeout settings in the database configuration. However, this is usually a temporary solution and should be approached with caution.
  Implement Proper Indexing: Ensure that the database tables are properly indexed to speed up data access and reduce lock times.
  Review Application Logic: Check the application logic to ensure that locks are being acquired and released appropriately. Avoid holding locks longer than necessary.
  Monitor System Performance: Regularly monitor system performance and lock statistics to identify trends and potential issues before they escalate.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to DB6122 for specific patches or recommendations from SAP.
  Database Documentation: Review the documentation for your specific database (e.g., Oracle, SQL Server, HANA) for best practices on managing locks and transactions.
  Performance Tuning: Consider engaging in performance tuning sessions to address systemic issues that may be contributing to lock contention.
  
  By addressing the underlying causes and implementing the suggested solutions, you can reduce the occurrence of lock timeouts and improve overall system performance.