Example: Online Restore of a Read-Only File (Full Recovery Model)
This topic is relevant for SQL Server databases under the full recovery model that contain multiple files or filegroups.
In this example, a database named adb, which uses the full recovery model, contains three filegroups. Filegroup A is read/write, and filegroup B and filegroup C are read-only. Initially, all of the filegroups are online.
A read-only file, b1, in filegroup B of database adb has to be restored. A backup was taken since the file became read-only; therefore, log backups are not required. Filegroup B is offline for the duration of the restore, but the remainder of the database remains online.
The syntax for an online restore sequence is the same as for an offline restore sequence.
To restore the file, the database administrator uses the following restore sequence:
RESTORE DATABASE adb FILE='b1' FROM filegroup_B_backup WITH RECOVERY
Filegroup B is now online.