Clontab is an Oracle E-Business Suite automation tool that allows DBAs to schedule and forget routine tasks like refreshes, patching, and instance start/stop operations. It automates the full refresh process including pre and post refresh steps. DBAs can register their Oracle E-Business Suite source and target instances with Clontab once, then schedule refresh and patching tasks to run on a defined schedule. This allows DBAs to focus on more important tasks rather than manual routine work.