How to: Restore Files and Filegroups over Existing Files (Transact-SQL)

1. Execute the RESTORE DATABASE statement to restore the file and filegroup backup, specifying:

   • The name of the database to restore.
     
   • The backup device from where the full database backup will be restored.
     
   • The FILE clause for each file to restore.
     
   • The FILEGROUP clause for each filegroup to restore.
     
   • The REPLACE option to specify that each file can be restored over existing files of the same name and location.
     

     Caution:
     Use the REPLACE option cautiously. For more information, see Using the REPLACE Option.

   • The NORECOVERY option. If the files have not been modified after the backup was created, specify the RECOVERY clause.
     

2. If the files have been modified after the file backup was created, execute the RESTORE LOG statement to apply the transaction log backup, specifying:

   • The name of the database to which the transaction log will be applied.
     
   • The backup device from where the transaction log backup will be restored.
     
   • The NORECOVERY clause if you have another transaction log backup to apply after the current one; otherwise, specify the RECOVERY clause.
     The transaction log backups, if applied, must cover the time when the files and filegroups were backed up.
     

The following example restores the files and filegroups for the MyNwind database, and replaces any existing files of the same name. Two transaction logs will also be applied to restore the database to the current time.

USE master
GO
-- Restore the files and filesgroups for MyNwind.
RESTORE DATABASE MyNwind
   FILE = 'MyNwind_data_1',
   FILEGROUP = 'new_customers',
   FILE = 'MyNwind_data_2',
   FILEGROUP = 'first_qtr_sales'
   FROM MyNwind_1
   WITH NORECOVERY,
   REPLACE
GO
-- Apply the first transaction log backup.
RESTORE LOG MyNwind
   FROM MyNwind_log1
   WITH NORECOVERY
GO
-- Apply the last transaction log backup.
RESTORE LOG MyNwind
   FROM MyNwind_log2
   WITH RECOVERY
GO

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