Online Restore in SQL 2005

Restoring data while the database is online is called an online restore. Online restore is supported only on SQL Server 2005 Enterprise Edition. In this edition, a file, page, or piecemeal restore is online by default. Online Restore applies to only those database which have multiple files or file groups. The database can be online when the primary filegroup is online and all other secondary filegroups are offline. By default the restore command in SQL 2005 EE is Online only.