How To Fix DB6542 - Time interval to determine deadlock situations

SAP Error Message - Details

• Message type: E = Error

• Message class: DB6 - DB6: Alert Monitoring and Alert Configuration

• Message number: 542

• Message text: Time interval to determine deadlock situations

What causes this issue?

A Deadlock is a mutual lock of two or more running transactions. It
means that they are both in a wait state and each is waiting for the
other.
Example:
T1 holds lock A and requires lock B.
T2 holds lock B and requires lock A.
The system resolves this wait situation by resetting one of the
transactions after a certain wait time has expired. The parameter
DLCHKTIME determines this wait time.

System Response

The bigger the value set for the parameter, the longer the deadlock
situations continue and block system operation. Conversely, you should
not set too low a value for the parameter, as identifying deadlocks in
the system can affect performance.

How to fix this error?

If errors occur, correct the parameter using the command:
<LB>UPDATE DB CFG USING DLCHKTIME <value></>

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DB6542 - Time interval to determine deadlock situations ?

  The SAP error message DB6542 indicates that there is a problem related to deadlock situations in the database. This message typically arises when the database system is unable to resolve a deadlock condition within a specified time interval. A deadlock occurs when two or more transactions are waiting for each other to release locks, leading to a situation where none of the transactions can proceed.
  Cause:
  
  
  Deadlock Situations: The primary cause of this error is the occurrence of deadlocks in the database. This can happen due to:
  
  Poorly designed database transactions that hold locks for too long.
  Concurrent transactions that are trying to access the same resources in conflicting ways.
  High contention for resources, especially in a multi-user environment.
  
  
  
  Configuration Issues: The time interval set for detecting deadlocks may be too short, leading to premature detection of deadlocks.
  
  
  Solution:
  
  
  Analyze and Optimize Transactions:
  
  Review the SQL statements and transaction logic to minimize the duration of locks.
  Ensure that transactions are as short as possible and that they access resources in a consistent order to avoid circular wait conditions.
  
  
  
  Increase Time Interval:
  
  If the deadlock detection time interval is too short, consider increasing it. This can usually be configured in the database settings. Consult your database documentation for specific instructions on how to adjust this parameter.
  
  
  
  Database Lock Monitoring:
  
  Use database monitoring tools to analyze lock contention and deadlock occurrences. This can help identify problematic transactions or queries that need optimization.
  
  
  
  Implement Retry Logic:
  
  In application code, implement retry logic for transactions that fail due to deadlocks. This can help mitigate the impact of deadlocks on user experience.
  
  
  
  Database Configuration:
  
  Review and adjust database configuration settings related to locking and deadlock detection. This may involve consulting with your database administrator.
  
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific recommendations or patches related to the DB6542 error. SAP frequently updates its knowledge base with solutions for known issues.
  Database Documentation: Refer to the documentation for your specific database (e.g., Oracle, SQL Server, HANA) for best practices on managing locks and deadlocks.
  Performance Tuning: Consider overall performance tuning of the database and application to reduce contention and improve transaction throughput.
  
  By addressing the underlying causes of deadlocks and optimizing transaction management, you can reduce the occurrence of the DB6542 error and improve the stability of your SAP system.