A user needs to be created in the source database, if you are using Oracle GoldenGate DDL support. This user performs maintenance on the Oracle GoldenGate database objects that support DDL capture.

A user is required in either the source or target database for the DEFGEN utility. The location depends on where the data definition file is being generated. This user performs local metadata queries to build a data-definitions file that supplies the metadata to remote Oracle GoldenGate instances.