Restore a site collection using Windows PowerShell in SharePoint 2010

1.      Open SharePoint 2010 Management Shell.

2.      At the Windows PowerShell command prompt

3.      Type the following command, and then press ENTER:

Restore-SPSite -Identity <Site collection URL> -Path <Backup file> [-DatabaseServer <Database server name>] [-DatabaseName <Content database name>] [-HostHeader <Host header>] [-Force] [-GradualDelete] [-Verbose]

4.      If you want to restore the site collection to a specific content database, use the DatabaseServer and DatabaseName parameters to specify the content database.

5.      If you do not specify a content database, the site collection will be restored to a content database chosen by Microsoft SharePoint Server 2010.

6.      If you are restoring a host-named site collection, use the Identity parameter to specify the URL and use the HostHeader parameter to specify the URL of the Web application that will hold the host-named site collection.

7.      If you want to overwrite an existing site collection, use the Force parameter.