Oracle Data Migration best usage in isolated servers

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I am looking for the best way to migrate data from one oracle database to another. Both databases are placed in isolated servers and unable to make direct connection between those databases.

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Migs Isip On

In my experience, we first did a Data Pump from the Source Database to the Destination Database using a Different Schema and Table Name (i.e. *_SRC). We then prepared a Mapping Table and a simple program to Transform the Data Sets from the Source to the Destination Tables. After running the program and doing the needed validations, we proceeded to unload the "_SRC" objects and schema to free up some tablespace.