Adding a content database using PowerShell in SharePoint 2010

Adding a content database using PowerShell in SharePoint 2010
To attach an existing content database:

Mount-SPContentDatabase "<ContentDb>" –DatabaseServer "<DbServer>"
–WebApplication http://WebapplicationName

<ContentDb> is the content database to be attached.

<DbServer> is the name of the database server.

http://WebapplicationName is the name of the Web application to which
the content database is being attached.

To detach a content database:

Dismount-SPContentDatabase "<ContentdBName>"

Where is the name of the content database.