How To Fix CNV_IUUC_REPL_ADV_SE198 - Using a non-key field for the filter can negatively impact performance

SAP Error Message - Details

• Message type: E = Error

• Message class: CNV_IUUC_REPL_ADV_SE - MEssage class for package CNV_IUUC_REPL_ADV_SETTINGS

• Message number: 198

• Message text: Using a non-key field for the filter can negatively impact performance

What causes this issue?

You have defined a filter for the initial load that uses a non-key
field. Using a non-key field for the filter can have a negative impact
on performance.

How to fix this error?

There are two options to improve performance:
You can create an index (unique or non-unique) for the non-key field.
If you are using reading type 4 or reading type 5, then using a
non-key field for the filter does not have a negative impact on
performance. To improve performance, you can therefore change the
reading type to reading type 4 or reading type 5.

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 CNV_IUUC_REPL_ADV_SE198 - Using a non-key field for the filter can negatively impact performance ?

  The SAP error message CNV_IUUC_REPL_ADV_SE198 indicates that a non-key field is being used in a filter condition during a data replication process. This can lead to performance issues because non-key fields do not have the same indexing and optimization as key fields, which can result in slower data retrieval and processing times.
  Cause:
  The primary cause of this error message is the use of a non-key field in a filter condition within a data replication or transformation process. Non-key fields are those that are not part of the primary key of a database table, and using them in filters can lead to inefficient queries that may require full table scans instead of utilizing indexes.
  Solution:
  To resolve this issue, consider the following steps:
  
  
  Review Filter Conditions: Check the filter conditions being applied in your data replication or transformation process. Identify any non-key fields that are being used.
  
  
  Use Key Fields: Modify the filter conditions to use key fields instead of non-key fields. Key fields are indexed and will provide better performance.
  
  
  Optimize Queries: If it is necessary to use non-key fields, consider optimizing the queries or the database schema to improve performance. This may involve creating additional indexes on the non-key fields, but this should be done with caution as it can also impact write performance.
  
  
  Analyze Performance: Use performance analysis tools available in SAP to monitor the impact of your changes. This can help you understand the performance implications of your filter conditions.
  
  
  Consult Documentation: Refer to SAP documentation or notes related to the specific replication process you are using. There may be additional recommendations or best practices provided by SAP.
  
  
  Testing: After making changes, conduct thorough testing to ensure that the performance has improved and that the data replication process is functioning as expected.
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or updates regarding this error message.
  Performance Tuning: Familiarize yourself with general performance tuning practices in SAP, especially related to database queries and data replication.
  Data Replication Tools: If you are using specific tools for data replication (like SAP Landscape Transformation (SLT)), review their documentation for best practices regarding filter conditions.
  
  By addressing the use of non-key fields in your filter conditions, you can mitigate the performance issues indicated by the error message CNV_IUUC_REPL_ADV_SE198.