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Transaction log, replication, and database mirroring
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If you are implementing either transactional replication or database mirroring, an additional requirement is imposed on a transaction log. Both these features guarantee delivery of data and therefore must ensure that data is successfully delivered before SQL Server can remove a transaction from the log, regardless of whether it has been backed up. When you are using these features, a transaction can be removed only when
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1. It has been successfully committed to the distribution database. 2. It has been successfully committed on the mirror database.
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Backing Up, Restoring, and Moving a Database
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The simplest way to execute a transaction log backup is to issue the following statement (see the SQL Server 2005 Books Online article noted previously for syntax details):
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BACKUP LOG <database name> TO DISK = <directory>\<filename> WITH INIT
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How do full, differential, and transaction log backups interact with each other A full backup is required before you can perform either a differential or a transaction log backup. Differential and transaction log backups occur independently of each other. The main purpose of a differential backup is to reduce the number of transaction log backups that you must restore in the event of a database failure.
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Quick Check Answer
Performing Filegroup Backups
Filegroup backups provide an alternative backup strategy to full backups. Instead of backing up the entire database, you can perform a filegroup backup to back up individual filegroups within the database. The starting point for a filegroup backup strategy must include a backup of all filegroups within the database so that you can reassemble all the filegroups within that database.
BEST PRACTICES
Using filegroup backups
You should select a filegroup backup method when the size of a database makes it impractical to either back up or restore an entire database while still meeting your recovery requirements.
Because a filegroup backup enables you to back up portions of a database, it requires you to configure the database in the Full or Bulk-Logged recovery model so that you can perform a filegroup backup that is read/write. To restore, you can then use filegroup, differential, and transaction log backups.
NOTE
Recovering from a filegroup backup
If you are restoring one or more filegroups with backups taken at different times, transaction log backups are a minimum requirement to roll all filegroups forward to a consistent point in time.
Lesson 1: Backing Up a Database
The simplest way to perform a filegroup backup is as follows:
BACKUP DATABASE <database name> FILEGROUP = <filegroup name> TO DISK = <directory>\<filen ame>
You can also take a differential backup on either a database or filegroup basis. The simplest form of a filegroup differential backup command is this:
BACKUP DATABASE <database name> FILEGROUP = <filegroup name> TO DISK = <directory>\<filen ame> WITH DIFFERENTIAL
Performing Mirrored Backups
Each backup operation creates a single copy of data on either disk or tape. It is then up to an administrator to create additional copies to protect your organization from media failure. This duplication process can be tedious and time-consuming, and the single backup becomes a potential single point of failure during the process. SQL Server 2005 introduces a new capability to the BACKUP command. You can create additional copies of a backup called mirrors during the backup operation. You accomplish this operation by using the following optional clause in the BACKUP command:
[[MIRROR TO <backup_device> [ ,...n ]][ ...next-mirror]]
You can create up to four mirrors, with three being specified in the MIRROR TO clause. A mirrored backup also places some restrictions on the media that you use. The media for each mirror must be of the same type as well as have the same number of devices. Each must also possess similar properties. For example, if you are backing up to disk, all mirrors must also be disks; if you are backing up to tape, all mirrors must be tape.
NOTE
Inside backup striping
A media set generally contains a single physical device, such as a file or tape drive. However, a media set can be constructed of up to 64 devices. When a media set encompasses multiple physical devices, the backup engine spawns one thread per physical device and writes a portion of the data within the backup to each device. This is not the same as the striping capability present in RAID technology, but it is similar in concept to what occurs with RAID 0. Each mirror must be identical. Therefore, if you specify a media set that contains two disk devices, each mirror must also contain two disk devices. Similarly, if your media set contains 64 tape devices, the mirror must specify 64 tape devices.
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