db rename

I thought there was an option to rename a database? I cannot seem to find the syntax in any of my books or on the web site. Am I incorrect? We are running 7.3.4. We have to bring our sytem down to upgrade the release this afternoon. There are a number of db changes taking place so I was thinking instead of taking the system down for an extended amount of time I could build another database with all our new items and then just rename it when we are ready.
Is there a rename option out there for our version?
thanks
Jodi