How To Fix CNV_IUUC_REPL_TS004 - Database deadlock detected in job &1/&2

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_IUUC_REPL_TS - Messages for troubleshooting functions

• Message number: 004

• Message text: Database deadlock detected in job &1/&2

What causes this issue?

Deadlock situations are preventing the execution of replication jobs.

System Response

One or more replication jobs are waiting for a lock to be released in
order to continue.

How to fix this error?

Examine the lock situations by using database tools (<DS:TRAN.DB02>Db
Admin</>). You might need to cancel certain replication processes in
order to release the locks. In case of an overall deadlock situation
that involves many system processes, contact your system administrator
for support.

Procedure for System Administrators

Deadlock situation detected for job &V1& - &V2& (function module
S_DB_EXCLUSIVE_LOCK_WAITERS).

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_IUUC_REPL_TS004 - Database deadlock detected in job &1/&2 ?

  The SAP error message CNV_IUUC_REPL_TS004 indicates that a database deadlock has been detected in a specific job. This typically occurs in the context of data replication or migration processes, particularly when using the SAP Landscape Transformation (SLT) Replication Server or similar tools.
  Cause:
  
  Deadlock Situation: A deadlock occurs when two or more processes are waiting for each other to release locks on resources, leading to a situation where none of the processes can proceed. In the context of SAP, this can happen during data updates, inserts, or deletes when multiple jobs or transactions are trying to access the same database resources simultaneously.
  High Concurrency: If there are multiple jobs running concurrently that are trying to access the same tables or rows, it can lead to contention and deadlocks.
  Long-Running Transactions: If a transaction holds locks for an extended period, it can increase the likelihood of deadlocks, especially if other transactions are trying to access the same resources.
  
  Solution:
  
  Analyze the Deadlock: Use database tools or transaction logs to analyze the deadlock situation. Most databases provide a way to capture deadlock information, which can help identify the processes involved and the resources they were trying to access.
  Optimize SQL Queries: Review and optimize the SQL queries being executed by the jobs. Ensure that they are efficient and do not hold locks longer than necessary.
  Reduce Concurrency: If possible, reduce the number of concurrent jobs that are accessing the same resources. This can be done by staggering job schedules or limiting the number of parallel processes.
  Increase Lock Timeout: In some cases, increasing the lock timeout settings in the database can help mitigate deadlocks, but this is more of a workaround than a solution.
  Implement Retry Logic: If deadlocks are unavoidable, implement retry logic in your application or job processing to handle deadlock exceptions gracefully.
  Database Configuration: Review the database configuration settings related to locking and transaction management. Adjusting these settings may help reduce the occurrence of deadlocks.
  
  Related Information:
  
  Monitoring Tools: Use SAP transaction codes like SM21 (System Log), ST22 (Dump Analysis), and SLG1 (Application Log) to monitor for errors and analyze the system behavior.
  Database-Specific Tools: Depending on the database being used (e.g., Oracle, SQL Server, HANA), there may be specific tools or commands to analyze deadlocks.
  SAP Notes: Check for relevant SAP Notes that may provide additional guidance or patches related to this error message. SAP Notes can be searched in the SAP Support Portal.
  Documentation: Review the documentation for the specific SAP module or tool you are using (e.g., SLT) for best practices on configuration and performance tuning.
  
  By following these steps, you should be able to identify the root cause of the deadlock and implement solutions to prevent it from occurring in the future.