After you configure file properties, you can select the external loader connection. To select the external loader connection, choose the connection type and the connection object. You configure connection options in the Connections settings on the Mapping tab.
If the session contains multiple partitions, and you choose a loader that can load from multiple output files, you can select a different connection for each partition, but each connection must be of the same type. For example, you can select different Teradata TPump external loader connections for each partition, but you cannot select a Teradata TPump connection for one partition and an Oracle connection for another partition.
If the session contains multiple partitions, and you choose a loader that can load from only one output file, use round-robin partitioning to route data to a single target file. You can choose a loader for each connection, but the Integration Service uses the connection for the first partition.
To select an external loader connection: