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Performing Database Backups
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To back up an entire database using Transact-SQL, you can use the following command syntax: BACKUP DATABASE {database | @database_variable} TO <backup_device> [,...n] [WITH [BLOCKSIZE = {blocksize | @blocksize_variable}] [[,] DESCRIPTION = {text | @text_variable}] [[,] DIFFERENTIAL] [[,] EXPIREDATE = {date | @date_variable} | RETAINDAYS = {days | @days_variable}] [[,] FORMAT | NOFORMAT] [[,] {INIT | NOINIT}] [[,] MEDIADESCRIPTION = {text | @text_variable}] [[,] MEDIANAME = {media_name | @media_name_variable}] [[,] [NAME = {backup_set_name | @backup_set_name_variable}] [[,] {NOSKIP | SKIP}] [[,] {NOUNLOAD | UNLOAD}] [[,] [RESTART] [[,] STATS [= percentage]] ] <backup_device> ::= { {backup_device | @backup_device_variable} | {DISK | TAPE | PIPE} = { temp_backup_device | @temp_backup_device_variable} } Table 6-4 lists the options that can be used with the BACKUP command. The backup device can be specified either as a predefined logical name for a backup device or as a file system file. SQL Server allows you to specify up to 32 different backup devices for this operation. Here is a simple BACKUP command:
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BACKUP TestDatabase to BackupDevice1
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In this example, all of the default settings will be used, along with the contents of the TestDatabase, for copying information to the backup device. Of course, you can specify much more information when backing up data. For example, the following command will back up all information on the Customers database:
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BACKUP DATABASE Customers TO BackupDevice2
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WITH DESCRIPTION = 'Full backup of Customers database', RETAINDAYS = 30, FORMAT, MEDIADESCRIPTION = 'Media for Customers database backup', MEDIANAME = 'CustomersMedia', NAME = 'CustomersFull', UNLOAD, STATS = 10
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Option BLOCKSIZE
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Function Specifies the size of data blocks written to backup media. Includes up to 255 characters of text describing the backup. Indicates that a differential backup will be made. Specifies the date on which the backup can be overwritten. Completely overwrites the media header when the backup is performed. Initializes the backup device. Specifies a name for the backup media.
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Notes Default options should be adequate unless otherwise recommended by the tape backup device vendor. Can be viewed when you need to know the contents of a backup device. A full backup must have been performed prior to the differential backup. If not specified, the server default setting (if any) will be used. Use when you are sure that the information on the tape is no longer needed and you want to begin a new set of backups. All contents of the backup device will be erased. Provides helpful information for cataloging and managing backups.
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DESCRIPTION
DIFFERENTIAL
EXPIREDATE
FORMAT
INIT MEDIANAME
Table 6-4.
Options Used with the BACKUP Command
6:
Performing Database Backups
Option NOFORMAT
Function Prevents the backup operation from overwriting the media header. Prevents initialization of the backup device. Ensures that the media has expired before allowing the backup operation to continue. Prevents the tape (or other media) from being ejected at the end of the backup operation. Restarts a backup operation that has aborted before completion. Specifies the number of days before the backup media should be overwritten. Instructs the backup operation to ignore the established backup expiration and media name. Indicates that statistics will be printed during the backup operation; can optionally specify the percentage increment that will be displayed.
Notes Use when you are sure the media contains a valid header and you do not want to overwrite this information. Use when you do not want to remove information from an existing backup device. Best used unless you are sure you want to overwrite backup information. Use when the tape will be reused for other backup operations. Append this command to the end of the original command to resume the operation at the point at which it was interrupted. If not specified, the server default setting (if any) will be used. Use when you are sure you want to overwrite media that has been formatted but has not yet expired. If no percentage value is specified, the default increment for output is 10 percent.
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