Forum Post: RE: Reverse Engineering fails for schema with large number of data tables

Using the Native/Direct connection requires the full Oracle client to be installed. It then uses the Oracle tnsnames.ora alias as the datasource to connect to the database. Here are links to some of our docs: http://docwiki.embarcadero.com/ERStudioDA/170/en/Using_Native_or_Direct_Database_Connections http://docwiki.embarcadero.com/ERStudioDA/170/en/Reverse_Engineering_an_Existing_Database Regards, Stan