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SAP Data Services 4.x Cookbook
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The transform object Data_Transfer is a pure optimization tool helping you to push down resource-consuming operations and transformations like JOIN and GROUP BY to the database level.
Take the dataflow from the Loading data from a flat file recipe in Chapter 4, Dataflow – Extract, Transform, and Load. This dataflow loads the Friends_*.txt file into a STAGE.FRIENDS table.
Modify the Friends_30052015.txt file and remove all lines except the ones about Jane and Dave.
In the dataflow, add another source table, OLTP.PERSON, and join it to a source file object in the Query transform by the first-name field. Propagate the PERSONTYPE and LASTNAME columns from the source OLTP.PERSON table into the output Query transform schema, as shown here:

Our goal will be to configure this new dataflow to push down the insert of the joined dataset of data coming from the file and data coming from the OLTP.PERSON table to a database...