A while ago my vCenter Service shutdown and I could not get it restarted. I looked in the event logs of the server and found this guy
Log Name: Application
Date: 11/14/2011 6:02:25 PM
Event ID: 9002
Task Category: (2)
The transaction log for database ‘VIM_VCDB’ is full. To find out why space in the log cannot be reused, see the log_reuse_wait_desc column in sys.databases
Not being a very big database person myself(although I am trying to learn), I found this great article telling me exactly what I needed to do in order to resolve this issue.
I thought this might be helpful