The primary difference is the level of interaction you need to have with the DBA. If you require on-site work, this is a good approach to augmenting current staff, design of schemas, defining business processes, capacity planning, and an excellent way to receive mentoring for your internal staff. Remote DBA is offered as a subscription service and provides a lower cost alternative to repetitive tasks such as monitoring, troubleshooting, and backups. It enables your senior DBA to be available for core activities such as design, tuning, and business processes.