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In the last Teradata Data Mover (TDM) article (Introduction to Teradata Data Mover: Create your first job), we discussed creating and executing a TDM job to copy a full table between Teradata systems. This use case is very common in the field when customers want to initially populate the target Teradata system with the same table that exists on the source Teradata system. Customers will not want to copy the entire table to the target system every time changes are made to the source system though. Tables on production systems can get quite large and it doesn't make sense to copy the entire table when only a subset of rows have been changed since the last copy took place. This is why TDM supports executing partial table copies as well as full table copies.