How To Fix CNV_DMC_HC066 - &1 - &2: Average latency (&3) has exceeded error threshold by &4

CNV_DMC_HC066 - Overview

• Message type: E = Error

• Message class: CNV_DMC_HC -

• Message number: 066

• Message text: &1 - &2: Average 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.

CNV_DMC_HC066 - Details

• The SAP error message CNV_DMC_HC066 typically relates to data migration processes, particularly in the context of SAP Data Migration Cockpit (DMC) or SAP S/4HANA migrations. This specific error indicates that the average latency of data processing has exceeded a predefined threshold, which can lead to performance issues during the migration process.
  
  Cause:
  
  
  High Latency: The average latency of data processing is too high, which can be caused by various factors such as:
  
  Network issues causing delays in data transfer.
  Resource contention on the database or application server.
  Inefficient data processing logic or transformations.
  Large volumes of data being processed at once.
  
  
  
  System Performance: The underlying system may not have sufficient resources (CPU, memory, I/O) to handle the data migration workload efficiently.
  
  
  
  Configuration Issues: Incorrect configuration settings in the migration tools or the underlying database can lead to performance bottlenecks.
  
  
  
  Solution:
  
  
  Monitor System Performance: Use monitoring tools to check the performance of the database and application servers. Look for CPU, memory,