How To Fix /SDF/DB6117 - Number of lock escalations per hour

SAP Error Message - Details

• Message type: E = Error

• Message class: /SDF/DB6 -

• Message number: 117

• Message text: Number of lock escalations per hour

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SDF/DB6117 - Number of lock escalations per hour ?

  The SAP error message /SDF/DB6117 indicates that there have been too many lock escalations occurring in the database within a specified time frame (per hour). Lock escalations happen when the database system converts many row-level locks into a table-level lock to reduce the overhead of managing numerous locks. This can lead to performance issues and contention for resources, as table-level locks can block other transactions from accessing the locked table.
  Causes:
  
  High Concurrency: A large number of transactions trying to access the same table simultaneously can lead to lock escalations.
  Long-Running Transactions: Transactions that hold locks for an extended period can increase the likelihood of escalations.
  Inefficient Queries: Poorly optimized queries that require many locks can contribute to the problem.
  Database Configuration: Certain database settings may not be optimized for the workload, leading to excessive lock escalations.
  Application Design: Inefficient application logic that leads to excessive locking can also be a contributing factor.
  
  Solutions:
  
  Optimize Queries: Review and optimize SQL queries to reduce the number of locks they require. Use indexes effectively to minimize the number of rows locked.
  Reduce Transaction Duration: Ensure that transactions are kept as short as possible. Commit or roll back transactions promptly to release locks.
  Increase Lock Granularity: If possible, configure the database to use finer-grained locking mechanisms, which can help reduce the need for escalations.
  Monitor and Analyze Locking Behavior: Use database monitoring tools to analyze locking behavior and identify problematic transactions or queries.
  Adjust Database Configuration: Review and adjust database parameters related to locking and concurrency to better handle the workload.
  Review Application Logic: Ensure that the application logic is designed to minimize locking contention, such as avoiding long-running transactions and unnecessary locks.
  
  Related Information:
  
  Database Documentation: Refer to the specific database documentation (e.g., SAP HANA, Oracle, SQL Server) for details on locking mechanisms and configuration options.
  SAP Notes: Check SAP Notes for any known issues or patches related to lock escalations and performance tuning.
  Performance Monitoring Tools: Utilize SAP's performance monitoring tools (like ST03N, ST04) to analyze system performance and locking issues.
  Consult with Database Administrators: Work closely with your database administrators to identify and resolve locking issues effectively.
  
  By addressing the underlying causes and implementing the suggested solutions, you can reduce the frequency of lock escalations and improve overall system performance.