Why is it important to start the Database Design Transformer from the Repository Object Navigator (RON)?
Start the Database Design Transformer from RON, because if you select entities in the RON Navigator, those entities will automatically have the In Set box checked when DDT starts. This could save a significant amount of time if you are running the utility for a subset of the entities. Starting DDT from RON is also recommended when you are just getting started with Oracle Designer or with a new team of developers, so you can check the output of DDT and make corrections to the analysis-level objects before all the design-level objects are created.