The current default mining strategy is meant to track DDL changes and that implies a need to write the data dictionary to the redo logs to do that. Should we consider not using this mode as the default since it does have the implication of being heavier on the database and instead rely on the online mode where we don't track DDL and write the data dictionary for performance reasons? We could adjust the documentation to indicate that if you want DDL tracking support, the mining strategy would need to be changed from its default?