Revalidate jobs execute the validation logic/rules for records that have been modified since the initial validation during the Load Process. You can run Revalidate if/when records change post the initial Load process’s validation step. If no records change, no records are updated. If some records have changed and get caught by the existing validation rules, the metrics will show the results.
Revalidate jobs can only be run if validation is enabled on a column after an initial load and prior to merge on base objects that have validate rules setup.
Revalidate is executed manually using the batch viewer for base objects.