Backing Up, Restoring, and Moving a Database in .NET

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Backing Up, Restoring, and Moving a Database
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This process ensures that the database is completely consistent as of the time that the backup completes. The basic command to back up a database is as follows:
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BACKUP DATABASE <database name> TO DISK = <directory>\<filename> WITH INIT
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You use the TO clause in the BACKUP DATABASE command to specify the backup device to send the backup to, which can be the name of a logical backup device that is created, or you can specify an explicit path to either DISK or TAPE. The WITH clause has more than a dozen parameters, all of which are optional. The INIT parameter, which is the most common, tells SQL Server to overwrite anything in the backup device that might already exist before starting the backup operation.
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Backup syntax
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For a complete discussion of the BACKUP DATABASE command, including all possible options, see the article BACKUP (Transact-SQL) in SQL Server 2005 Books Online.
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Performing Differential Backups
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A differential backup captures all the extents that have changed since the last full backup. And the main purpose of a differential backup is to reduce the number of transaction log backups that need to be restored. You use a differential backup along with a full backup. If a full backup does not exist, you cannot create a differential backup. As with a full backup, you can perform a differential backup of a database no matter what recovery model is specified for the database. Note that a differential backup is NOT an incremental backup. An incremental backup captures any changes since the previous incremental backup. Therefore, restoring an incremental backup requires all other incremental backups. A differential backup always captures every extent that has changed since the last full backup. So each differential backup contains everything that any previous differential backup taken after a full backup contains. For example, suppose that a full backup occurs at midnight, with differential backups taken every four hours during the day. The differential backup at 04:00 contains all extents that have changed since midnight. The differential backup at 08:00 contains all extents that have changed since midnight. And the noon differential backup contains all extents that have changed since midnight. To determine the extents that need to be backed up by a differential backup, SQL Server maintains an extent map. An extent map is just another data page within the
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Lesson 1: Backing Up a Database
database, with each bit on the page representing an extent. When SQL Server changes an extent, it changes the corresponding bit for that extent from 0 to 1. When you perform a full backup, SQL Server resets all bits to 0. In this way, SQL Server has to interrogate only this page to determine which extents it needs to back up. Because databases can be an unlimited size and data pages are only 8 KB in size, SQL Server creates one of these mapping pages for approximately every 8,192 extents that it allocates to objects in the database. So a single page can cover thousands of data pages. The simplest command to perform a differential backup is as follows:
BACKUP DATABASE <database name> TO DISK = <directory>\<filename> WITH DIFFERENTIAL
This command is almost exactly the same as the command to perform a full database backup except that it requires use of the DIFFERENTIAL parameter. All other options are the same as with a full backup.
Transaction Log Backups
You can perform transaction log backups only for databases you have configured to use the Full or Bulk-Logged recovery model and that have not yet had a minimally logged transaction executed. Transaction log backups are also allowed only after a full backup has been performed. A transaction log backup contains only a subset of data and requires that you also have at least a full backup to recover the database. A log backup backs up the active log. It starts at the Log Sequence Number (LSN) at which the previous log backup completed. SQL Server then backs up all subsequent transactions until the backup encounters an open transaction. After SQL Server encounters an open transaction, the log backup completes. Any LSNs that are backed up are then allowed to be removed from the transaction log, which enables the system to reuse log space.
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