When you use a dynamic lookup cache, you can configure fields to be ignored when
Data Integration
compares the values in the lookup fields with the values in the associated incoming fields. Ignoring some fields in the comparison can improve mapping performance.
When you run a mapping that uses a dynamic lookup cache, by default,
Data Integration
compares the values in all lookup fields with the values in the associated incoming fields.
Data Integration
compares the values to determine whether to update the row in the lookup cache. When a value in an incoming field differs from the value in the lookup field,
Data Integration
updates the row in the cache.
If you do not want to compare all fields, you can choose the fields that you want
Data Integration
to ignore when it compares fields. For example, the source data includes a column that indicates whether the row contains data that you need to update. Enable the
Ignore in Comparison
property for all lookup fields except the field that indicates whether to update the row in the cache and target table.
Configure the fields to be ignored on the
Return Fields
tab of the Lookup transformation. To ignore a field, enable the
Ignore in Comparison
property for the field.
You must configure the transformation to compare at least one field unless the lookup condition
contains all the lookup fields.