How To Fix CNV_DMC_HC051 - &1 - &2: Maximum latency (&3) has exceeded error threshold by &4

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_DMC_HC -

• Message number: 051

• Message text: &1 - &2: Maximum latency (&3) has exceeded error threshold by &4

What causes this issue?

SAP Landscape Transformation Replication Server calculates the time
between the recording of a change in the source system and sending this
data to the target. The respective threshold has been exceeded.

System Response

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

How to fix this error?

Many different elements influence latency. It is always a good idea with
starting to monitor the latency values over some time. You can view
historical latency information in transaction LTRC. On the tab
<ZK>Expert Functions</>, choose <ZK>Display Replication Statistics</>.
If there are consistently high latency values, there may be issues with
the connections to the source or target systems, or issues within the
operations executed in these systems.
If you see different latency values (maybe aligned your business hours),
it is likely that the amount of changes in the source system is higher
than what SAP Landscape Transformation Replication Server can transfer
with one job. If this is the case, options for improving latency include
filtering the data, or specifying ranges for the logging table (for more
information, see <ZK>Performance Options</> in transaction LTRS).

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CNV_DMC_HC051 - &1 - &2: Maximum latency (&3) has exceeded error threshold by &4 ?

  The SAP error message CNV_DMC_HC051 typically relates to data migration processes, particularly in the context of SAP's Data Migration Cockpit or similar tools. This error indicates that the maximum latency for a data migration operation has exceeded a predefined threshold, which can lead to performance issues or data integrity concerns.
  Cause:
  
  
  High Latency: The primary cause of this error is that the time taken for data processing or transfer exceeds the acceptable limits set in the system. This can happen due to:
  
  Network issues causing delays in data transfer.
  Performance bottlenecks in the source or target systems.
  Large volumes of data being processed at once.
  Inefficient data transformation or mapping processes.
  
  
  
  System Resource Constraints: Insufficient system resources (CPU, memory, I/O) on either the source or target system can lead to increased processing times.
  
  
  Configuration Issues: Incorrect configuration settings in the data migration tool or the underlying database can also contribute to latency.
  
  
  Solution:
  
  
  Monitor and Optimize Performance:
  
  Check the network performance and ensure that there are no bottlenecks.
  Monitor system resources (CPU, memory, disk I/O) on both the source and target systems. Upgrade resources if necessary.
  Optimize the data migration process by breaking down large data sets into smaller batches.
  
  
  
  Adjust Latency Thresholds:
  
  If the current threshold is too strict for your specific use case, consider adjusting the latency threshold settings in the migration tool configuration. However, this should be done with caution, as it may mask underlying performance issues.
  
  
  
  Review Data Transformation Logic:
  
  Analyze the data transformation and mapping logic to ensure it is efficient. Look for any unnecessary complexity that could be simplified.
  
  
  
  Check Logs and Error Messages:
  
  Review the logs generated during the migration process for any additional error messages or warnings that could provide more context on the issue.
  
  
  
  Consult SAP Documentation:
  
  Refer to the official SAP documentation for the specific data migration tool you are using. There may be specific recommendations or best practices for handling latency issues.
  
  
  
  Engage SAP Support:
  
  If the issue persists after trying the above solutions, consider reaching out to SAP support for further assistance. They may provide insights based on the specific version and configuration of your SAP environment.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide patches and updates.
  Performance Tuning: Look into general performance tuning guidelines for SAP systems, which can help improve overall system responsiveness during data migration.
  Data Migration Best Practices: Familiarize yourself with best practices for data migration in SAP, which can help prevent similar issues in the future.
  
  By addressing the underlying causes of the latency and optimizing the migration process, you should be able to resolve the CNV_DMC_HC051 error effectively.