Handy command in Sharepoint 2010
Move-SPSite <SiteURL> -DestinationDatabase <DBName>
Before you execute this command be aware that:
1. this will put your site offline when running. Users will get error when browsing the site:
The website declined to show this webpage (403)
2.You will have to perform IISRESET afterwards
3.But cheer up, command executes suprisinly quick when comparing with execution of Restore-SPSite. For 7 GB site it took only 5 minutes.