Moving a site collection to another content database is a task that is incumbent upon a SharePoint Farm Administrator. There are several reasons why this may need to be done:
This is going to be shown via PowerShell. The strength of this method is that it facilitates the scripting of tasks that are considered repetitive. In this way, administrators can create scripts to move more than one site collection at a time.
User must have access to one of the servers running PowerShell 2.0 and should be a member of the
WSS_ADMIN_WPG on the local computer. User ...