Scenario
You want to upgrade one or more SharePoint 2007 web sites to SharePoint 2010
How to
Create a copy of your SharePoint 2007 content database.
Run PowerShell script
Mount-SPContentDatabase -Name DBName -WebApplication http\\site:port -DatabaseServer DBServer -ClearChangeLog
You cannot add the content database through
Technet link:
http://technet.microsoft.com/en-us/library/ff607581.aspx
