Restarting One Database Not Entire Server Is there anyway to restart one database in SQL Server instead of restarting the entire server?  I have a task in perpetual rollback on one of my databases.  I'd like to restart it without turning off / on the other DBs
You can try taking it offline, and then online again:

use master
go

alter database YourDatabase
set offline
with rollback immediate
go

alter database YourDatabase
set online
go


As per BOL:


  OFFLINE : The database is closed, shut down cleanly, and marked offline. The database cannot be modified while it is offline.