How To Fix DB6116 - Too many deadlocks occur in the system

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 116

• Message text: Too many deadlocks occur in the system

What causes this issue?

Two or more running transactions are both in a wait state are are
waiting for each other. The system resolves this wait situation by
resetting one of the transactions after a certain wait time has
expired.

System Response

The waiting processes are blocked udring the wait state.

How to fix this error?

Confirm which applications are caught in the deadlock situations, and,
if necessary, modify these applications. You should also observe the
lock escalations, as these can also lead to deadlocks.
You can shorten the times for which the processes involved are blocked
using the database configuration parameters LOCKTIMEOUT and DLCHKTIME.

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 DB6116 - Too many deadlocks occur in the system ?

  The SAP error message DB6116 indicates that there are too many deadlocks occurring in the database system. A deadlock is a situation where two or more transactions are waiting for each other to release locks, causing them to be stuck indefinitely. This can lead to performance issues and can affect the overall stability of the system.
  Causes of DB6116
  
  High Concurrency: A large number of transactions trying to access the same resources simultaneously can lead to deadlocks.
  Locking Strategy: Inefficient locking strategies or inappropriate isolation levels 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 chances of deadlocks.
  Poorly Designed Database Schema: A database schema that does not optimize access patterns can lead to contention for resources.
  Application Logic: Application code that does not handle transactions properly can lead to deadlocks.
  
  Solutions to DB6116
  
  Analyze Deadlock Situations: Use database tools to analyze deadlock situations. Most databases provide logs or tools to help identify deadlocks and the transactions involved.
  Optimize Transaction Logic: Review and optimize the application logic to ensure that transactions are as short as possible and that they acquire locks in a consistent order.
  Adjust Isolation Levels: Consider adjusting the isolation levels of transactions to reduce locking contention. For example, using a lower isolation level like Read Committed instead of Serializable can help.
  Implement Retry Logic: Implement retry logic in the application to handle deadlocks gracefully. If a transaction fails due to a deadlock, it can be retried after a short delay.
  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 it as necessary to reduce contention and improve throughput.
  
  Related Information
  
  SAP Notes: Check SAP Notes for any specific recommendations or patches related to the DB6116 error.
  Database Documentation: Refer to the documentation of the specific database being used (e.g., Oracle, SQL Server, HANA) for best practices on managing deadlocks.
  Performance Monitoring Tools: Utilize performance monitoring tools to track transaction performance and identify potential bottlenecks.
  
  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.