How To Fix /SDF/DB6123 - Number of lock waits per hour

SAP Error Message - Details

• Message type: E = Error

• Message class: /SDF/DB6 -

• Message number: 123

• Message text: Number of lock waits per hour

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SDF/DB6123 - Number of lock waits per hour ?

  The SAP error message /SDF/DB6123 indicates that the number of lock waits per hour has exceeded a predefined threshold. This typically points to issues related to database locking, which can occur when multiple transactions are trying to access the same data simultaneously, leading to contention and delays.
  Cause:
  
  High Concurrency: Multiple users or processes are trying to access the same data at the same time, leading to lock contention.
  Long-Running Transactions: Transactions that take a long time to complete can hold locks for extended periods, causing other transactions to wait.
  Inefficient Queries: Poorly optimized queries can lead to longer execution times and increased lock duration.
  Database Configuration: The database may not be configured optimally for the workload, leading to increased lock waits.
  Application Design: The way the application is designed may lead to excessive locking, such as not releasing locks promptly.
  
  Solution:
  
  Analyze Lock Waits: Use transaction codes like SM12 (to view lock entries) and SM21 (to check system logs) to analyze which locks are causing the waits.
  Optimize Transactions: Review and optimize long-running transactions to ensure they complete as quickly as possible.
  Improve Query Performance: Analyze and optimize SQL queries to reduce execution time and lock duration. Use transaction ST05 (SQL Trace) to identify slow queries.
  Adjust Lock Timeout Settings: Depending on the database, you may be able to adjust lock timeout settings to reduce the impact of lock waits.
  Database Tuning: Work with your database administrator to tune the database configuration for better performance and reduced locking issues.
  Review Application Logic: Ensure that the application logic is designed to minimize locking, such as using appropriate isolation levels and releasing locks as soon as they are no longer needed.
  Monitor and Alert: Set up monitoring and alerting for lock waits to proactively address issues before they impact users.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to lock management and performance tuning for specific guidance and updates.
  Database Documentation: Refer to the documentation for your specific database (e.g., HANA, Oracle, SQL Server) for best practices on managing locks and performance tuning.
  Performance Monitoring Tools: Utilize SAP's performance monitoring tools (like SAP Solution Manager) to get insights into system performance and locking issues.
  
  By addressing the underlying causes of lock waits and optimizing both the application and database configurations, you can reduce the occurrence of the /SDF/DB6123 error and improve overall system performance.