![]() ![]() If a tape has been accidentally left open, the fastest way to release the tape is by using the following command: RESTORE REWINDONLY FROM TAPE = backup_device_name. These include in-use tapes that are temporarily idle while they wait for the next BACKUP or RESTORE operation. To view a list of open tape devices and the status of mount requests, query the sys.dm_io_backup_tapes dynamic management view. For more information about the RESTORE syntax and arguments, see RESTORE (Transact-SQL) and RESTORE Arguments (Transact-SQL), respectively. The default behavior is to rewind the tape (REWIND).įor more information about the BACKUP syntax and arguments, see BACKUP (Transact-SQL). You can control whether SQL Server keeps the tape remains open after the backup or restore operation or releases and rewinds the tape after it fills. UNLOAD/NOUNLOAD is a session setting that persists for the life of the session or until it is reset by specifying the alternative. You can control whether a backup tape is unloaded automatically from the tape drive after a backup or restore operation. To facilitate tape management, the BACKUP statement provides the following tape-specific options: ![]() TO DISK = Tape-Specific BACKUP and RESTORE options (Transact-SQL) The basic BACKUP syntax for specifying a backup file by using its physical device name is: Specify a backup file using its physical name (Transact-SQL) Also, putting the database and backup files on the separate devices optimizes the I/O performance for both the production use of the database and the writing of backups. If database files and backup files are on the same device and the device fails, the database and backups will be unavailable. This is necessary to make sure that you can access the backups if the data or log disk fails. We recommend that a backup disk be a different disk than the database data and log disks. SQL Server management tools are very flexible at handling disk backup devices because they automatically generate a time-stamped name on the disk file. For information about how to use a remote disk, see Backing Up to a File on a Network Share, later in this topic. A backup disk can be a local disk on the server or a remote disk that is a shared network resource. Alternatively, you could use a hot-swappable disk drive that would let you transparently replace a full disk on the drive with an empty disk. The maximum size of a backup file is determined by the free disk space available on the disk device therefore, the appropriate size for a backup disk device depends on the size of your backups.Ī disk backup device could be a simple disk device, such as an ATA drive. If a disk file fills while a backup operation is appending a backup to the media set, the backup operation fails. SQL Server Backups can also be written to Azure Blob Storage in addition to disk or tape. If a backup requires multiple backup devices, the devices all must correspond to a single type of device (disk or tape). A backup can be written to from 1 to 64 backup devices. For more information about media sets, see Media Sets, Media Families, and Backup Sets (SQL Server).Įither a tape drive or a disk file that is provided by the operating system. A backup file is a regular operating system file.Īn ordered collection of backup media, tapes or disk files, that uses a fixed type and number of backup devices. Terms and definitionsĪ hard disk or other disk storage media that contains one or more backup files. Backups on a set of one or more backup devices compose a single media set. This physical backup device is initialized when the first backup in a media set is written to it. The number of tapes required for the various database and transaction log backups of the day.During a backup operation on a SQL Server database, the backed up data (the backup) is written to a physical backup device.Use at least two tape sets in rotation so that the last two backups are always available. Keep the last database backup of each month for a year and the last database backup in the financial year permanently. Both the SQL Server Management Studio and the DBA Planning Calendar provide options to protect tapes or disk backup devices from being overwritten during the backup cycle. This means the backup cannot be overwritten for 27 days. Transaction log, full database backups and differential database backups. ![]() A network backup device is a file on a shared network directory.įor instructions on how to back up to disk, refer to the SQL Server Books Online. A local device is a file on a local computer. If you decide to back up to disk, SQL Server supports both local and network backup devices. When the SAP system is installed, three tape backup devices are automatically created, R3DUMP0, R3DUMP1, R3DUMP2. The term tape backup device refers to a tape device. ![]()
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