The UCS Manager window has three tabs:
Manual task for performing one-time maintenance.
Scheduled task on Main DB for scheduling periodic maintenance on the main database.
Scheduled task on Archive DB for scheduling periodic maintenance on the archive database.
Note the following definitions:
Pruning is the process of removing threads from either the main or the archive database.
Archiving is the process of removing selected threads from the main database and storing them in the archive database.
Maintenance is a cover term for pruning and archiving.