When a database instance no longer needs to be managed through DMC, you can delete it via instance management. Deleting the instance will not affect the data of the source database instance, and the database instance can be added back to the DMC.
Prerequisites
The operating user should hold the DMC administrator role.
Directions
2. In the top menu bar, click Instance List.
3. In the Operation column corresponding to the target database instance, select More > Delete.
4. In the pop-up dialog box, click Delete.