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5. When you re ready to start the restoration operation, click the OK button. SQL Server will immediately begin the operation. Within Enterprise Manager, choosing the types of restoration options you need should be quite simple (as long as you understand the terminology and processes). Now, let s move on and look at how we can create commands to perform the same tasks without the GUI interface.
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The RESTORE command can be used to retrieve information about existing backups and files. Table 7-5 lists the commands and their functions; Table 7-6 provides their syntax.
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Table 7-5.
RESTORE Commands
AM FL Y
Function Lists information about the files that reside on a backup device. Returns the header information from a backup device. Identifies the media in a current device. Verifies that backup sets are present and readable, but does not compare actual data.
Recovery using Transact-SQL commands is similar to the methods used to perform backups. The commands are fairly simple, yet powerful enough to offer a variety of options. Transact-SQL commands can be scheduled to run via SQL Server Agent as Jobs. The commands also are useful for creating scripts that can be run in emergency restoration procedures. Note, however, that recovery scripts should be kept synchronized with backup operations when one changes, you should always remember to change the other. In this section, we ll look at the syntax for the RESTORE command, along with some examples.
Notes Includes logical and physical names, file sizes, and filegroup information. Can take a long time on tape media. Can be much quicker than restoring additional information from tape media. Use to verify that the proper backup sets have been saved to tape; doesn t replace test restoration processes.
Team-Fly
SQL Server 7 Backup & Recovery
Command RESTORE FILELISTONLY
Syntax RESTORE FILELISTONLY FROM <backup_device> [WITH [FILE = file_number] [[, ] {NOUNLOAD | UNLOAD}] ] RESTORE HEADERONLY FROM <backup_device> [WITH {NOUNLOAD | UNLOAD}] RESTORE LABELONLY FROM <backup_device> [WITH {NOUNLOAD | UNLOAD}] RESTORE VERIFYONLY FROM <backup_device> [,...n] [WITH [FILE = file_number] [[,] {NOUNLOAD | UNLOAD}] [[,] LOADHISTORY] ]
RESTORE HEADERONLY
RESTORE LABELONLY
RESTORE VERIFYONLY
Table 7-6.
Syntax for the RESTORE Commands
The following syntax is used for specifying a backup device: <backup_device> ::= { { backup_device | @backup_device_var} | {DISK | TAPE | PIPE} = { temp_backup_device | @temp_backup_device_var} } To see a list of all the files on a specific backup device, use the following: RESTORE FILELISTONLY FROM backup_device Figure 7-4 shows the results of running a RESTORE command with the FILELISTONLY option. Now that you ve seen some useful commands for viewing information about backup devices, let s look at how to perform actual restoration operations.
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Figure 7-4.
The results of the RESTORE FILELISTONLY operation in Query Analyzer
Restoring from Full or Differential Backups
The RESTORE DATABASE command is used to copy information from full or differential database backups to a new or existing database on the local server. The syntax for the RESTORE DATABASE command is as follows: RESTORE DATABASE {database | @database_var} [FROM <backup_device> [,...n]] [WITH [DBO_ONLY] [[,] FILE = file_number] [[,] MEDIANAME = {media_name | @media_name_var}] [[,] MOVE logical_file TO operating_system_file ] [,...n] [[,] {NORECOVERY | RECOVERY | STANDBY = undo_file}] [[,] {NOUNLOAD | UNLOAD}] [[,] REPLACE] [[,] RESTART] [[,] STATS [= percentage]] ]
SQL Server 7 Backup & Recovery
<backup_device> ::= { { backup_device | @backup_device_var} | {DISK | TAPE | PIPE} = { temp_backup_device | @temp_backup_device_var} } Table 7-7 explains each of the parameters for the RESTORE command.
Parameter DBO_ONLY
Function Sets the DBO Use Only option for the database after completing the restoration operation.
Notes Restricts access to the database to only the database owner, which can be useful when consistency checks or other tests must be performed before allowing users to access the database; often specified with the RECOVERY command. Information about the files in a backup set can be obtained by using the RESTORE commands to view media headers. Restoration operation will be performed only if the media name matches this value (if specified); useful for ensuring that the correct tape or backup device is being used before performing a restoration. Useful when restoring from backups made on another server or when data files must be moved due to configuration changes or hardware failures; multiple MOVE statements can be used with a single RESTORE command as long as multiple logical files exist on the backup device.
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