How To Fix DB6PM824 - Deadlock Monitor has been started

SAP Error Message - Details

• Message type: E = Error

• Message class: DB6PM - DB2 UDB for UNIX, Windows: Performance Monitoring

• Message number: 824

• Message text: Deadlock Monitor has been started

Self-Explanatory Message

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• What is the cause and solution for SAP error message DB6PM824 - Deadlock Monitor has been started ?

  The SAP error message DB6PM824 indicates that the Deadlock Monitor has been started. This message typically arises in the context of database operations where a deadlock situation has been detected. A deadlock occurs when two or more processes are waiting for each other to release resources, leading to a standstill.
  Cause:
  
  Deadlock Situation: The primary cause of this error is a deadlock in the database. This can happen when multiple transactions are trying to access the same resources in a conflicting manner.
  Long-Running Transactions: Transactions that take a long time to complete can increase the likelihood of deadlocks.
  Poorly Designed Database Schema: Inefficient indexing or table design can lead to contention for resources.
  Concurrency Issues: High levels of concurrent access to the same data can lead to deadlocks.
  
  Solution:
  
  Analyze Deadlock Logs: Use the database's deadlock monitoring tools to analyze the deadlock situation. Look for patterns in the transactions that are causing the deadlocks.
  Optimize Transactions: Review and optimize the transactions that are involved in the deadlock. Ensure that they are as short as possible and that they access resources in a consistent order.
  Increase Isolation Levels: If applicable, consider adjusting the isolation levels of transactions to reduce the likelihood of deadlocks.
  Implement Retry Logic: In application code, implement retry logic for transactions that fail due to deadlocks. This can help to automatically resolve transient deadlock situations.
  Database Configuration: Check the database configuration settings related to locking and deadlock detection. Adjusting these settings may help mitigate deadlocks.
  Monitor and Tune Performance: Regularly monitor database performance and tune queries and indexes to reduce contention.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to deadlocks and performance tuning for specific recommendations based on your SAP version and database.
  Database Documentation: Refer to the documentation for your specific database (e.g., Oracle, SQL Server, HANA) for best practices on handling deadlocks.
  Transaction Logs: Review transaction logs to identify which transactions are frequently involved in deadlocks.
  SAP Community: Engage with the SAP Community forums for insights and shared experiences from other users who may have encountered similar issues.
  
  By addressing the underlying causes of deadlocks and implementing best practices, you can reduce the occurrence of the DB6PM824 error and improve overall system performance.