How To Fix D3188 - Deadlocks reported by the database

SAP Error Message - Details

• Message type: E = Error

• Message class: D3 - CCMS - DB2 on OS390

• Message number: 188

• Message text: Deadlocks reported by the database

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message D3188 - Deadlocks reported by the database ?

  The SAP error message D3188 indicates that a deadlock has been detected by the database. A deadlock occurs when two or more transactions are waiting for each other to release locks, resulting in a situation where none of the transactions can proceed. This can lead to performance issues and can affect the overall stability of the system.
  Causes of Deadlocks:
  
  Concurrent Transactions: Multiple transactions trying to access the same resources in different orders can lead to deadlocks.
  Locking Strategy: Inefficient locking strategies or overly aggressive locking can increase the likelihood of deadlocks.
  Long-Running Transactions: Transactions that take a long time to complete can hold locks for extended periods, increasing the chance of deadlocks.
  Database Design: Poorly designed database schemas or indexes can lead to contention for resources.
  Application Logic: Application code that does not handle transactions properly can contribute to deadlocks.
  
  Solutions:
  
  Analyze Deadlock Logs: Check the database logs to identify the transactions involved in the deadlock. This can help you understand the locking patterns and the resources being accessed.
  Optimize Transaction Logic: Review and optimize the application logic to minimize the duration of transactions and reduce the number of locks held at any time.
  Consistent Locking Order: Ensure that all transactions acquire locks in a consistent order to prevent circular wait conditions.
  Reduce Lock Scope: Limit the scope of locks by using finer-grained locking or by reducing the number of rows locked in a transaction.
  Increase Isolation Level: In some cases, changing the isolation level of transactions can help reduce deadlocks, but this may have other performance implications.
  Database Configuration: Review and adjust database configuration settings related to locking and transaction management.
  Monitor and Tune Performance: Regularly monitor the performance of the database and tune queries and indexes to reduce contention.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to deadlocks and database performance for specific recommendations and patches.
  Database Documentation: Refer to the documentation of the specific database being used (e.g., Oracle, SQL Server, HANA) for best practices on managing locks and transactions.
  Transaction Management: Familiarize yourself with transaction management concepts in SAP and how they interact with the underlying database.
  
  By addressing the underlying causes and implementing the suggested solutions, you can reduce the occurrence of deadlocks and improve the stability and performance of your SAP system.