Doing maintenance on a dynamic cube in IBM Cognos 10 is quite straight-forward. It's even possible to schedule some maintenance tasks, like stopping and starting a cube, and refreshing the data cache by creating an administrative task in the Administration module, and creating a schedule on top of it.
IBM Cognos Business Intelligence 10.2.1.1 Fix Pack 3 introduces a new and exciting tool called DCAdmin, in which you can do all of these tasks from the command line. This allows an administrator to incorporate starting and stopping dynamic cubes from within another process.
For instance : stop cubes before an ETL load in order to save memory on the server, and starting them again after the ETL has completed. Just one example of how such a tool might come in handy.
You can check out this article on the IBM support site for more information on how to use this tool.
http://www-01.ibm.com/support/docview.wss?uid=swg27040451
Good luck!