How To Fix /SDF/DB6120 - Too many exclusive lock escalations occur in the system

SAP Error Message - Details

• Message type: E = Error

• Message class: /SDF/DB6 -

• Message number: 120

• Message text: Too many exclusive lock escalations occur in the system

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SDF/DB6120 - Too many exclusive lock escalations occur in the system ?

  The SAP error message /SDF/DB6120 Too many exclusive lock escalations occur in the system typically indicates that the system is experiencing a high number of exclusive lock escalations. This can happen when the database is trying to manage locks for transactions, and it is unable to do so efficiently, leading to performance issues or potential deadlocks.
  Causes:
  
  High Concurrency: A large number of concurrent transactions trying to access the same data can lead to excessive locking.
  Lock Escalation: When the number of row-level locks exceeds a certain threshold, the database may escalate to page-level or table-level locks, which can lead to contention and performance degradation.
  Long-Running Transactions: Transactions that hold locks for an extended period can prevent other transactions from acquiring the necessary locks, leading to escalations.
  Inefficient Queries: Poorly optimized queries that require excessive locking can contribute to this issue.
  Configuration Issues: Database configuration settings related to locking and transaction management may not be optimal for the workload.
  
  Solutions:
  
  Analyze Locking Behavior: Use transaction codes like SM12 (to view locks) and SM21 (to check system logs) to analyze which transactions are causing excessive locking.
  Optimize Queries: Review and optimize SQL queries to reduce the number of locks they require. Ensure that indexes are used effectively.
  Reduce Transaction Duration: Break long-running transactions into smaller units of work to minimize the time locks are held.
  Adjust Lock Configuration: Depending on the database being used (e.g., HANA, Oracle, SQL Server), consider adjusting the lock escalation thresholds or other related parameters.
  Monitor System Performance: Use performance monitoring tools to identify bottlenecks and adjust system resources as necessary.
  Database Maintenance: Regularly perform database maintenance tasks such as updating statistics and rebuilding indexes to improve performance.
  Review Application Logic: Ensure that the application logic is designed to minimize locking contention, such as using appropriate isolation levels.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to locking and performance issues. SAP frequently releases notes that provide guidance on specific error messages and performance tuning.
  Database Documentation: Refer to the documentation for the specific database being used with SAP (e.g., HANA, Oracle, SQL Server) for best practices on managing locks and transactions.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have implemented.
  
  By addressing the underlying causes and implementing the suggested solutions, you can mitigate the occurrence of the /SDF/DB6120 error and improve overall system performance.