Before you run an External Match job, you must populate the EMI table with records to match against the records in the base object. The process of loading data into an EMI table is external to the

MDM Hub

. Use a data loading tool that works with your database environment.

When you populate the EMI table, you must supply data for at least one of the system columns to help link back from the _EMI table. The C_

BaseObject

_EMI table must also contain flat records with unique source keys and no foreign keys to other tables.