I have tempdb defined to an exclusive drive at 4GB, and currently there is only a couple hundred MBs left. I would like monitor what % of tempdb is being used, and see how close we are to exceeding our drive capacity. There is a perfmon counter to monitor % log full but not for the db. The % used is given on the database/space allocated page of EM. How can I capture this info and regularly monitor? I presume there is a query behind the page on the system tables but don't know the specifics.