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

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Backing Up, Restoring, and Moving a Database
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Overwriting and moving databases
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Restoring a full backup overwrites a database of the same name, if it already exists on the instance. If the database does not exist, the restore operation creates the files and filegroups for the database before restoring pages. Because creating the files from scratch can consume a significant amount of time, you should not drop a database before a restore if you are going to overwrite it. If you are using backup and restore to move a database to a different server with a different directory structure or the directory structure has changed, you can use the WITH MOVE option to cause the restore operation to create the underlying files in a path different from the original backup.
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An example of the syntax for a full database restore is as follows:
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RESTORE DATABASE PUBS FROM DISK = C:\DEMO\BACKUP\PUBSFULL.BAK WITH REPLACE, STANDBY = C:\ DEMO\BACKUP\PUBSSTANDBY.STN
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This command uses the contents of the PUBSFULL.BAK file for the restore operation. The REPLACE option tells SQL Server to overwrite the existing database named PUBS. The STANDBY option leaves the database in a restoring state: Writes are not allowed to occur in the database, but users can connect to the database and issue SELECT statements. The other important clauses in any restore command are WITH RECOVERY or WITH NORECOVERY. When a restore operation uses the WITH RECOVERY option, the database is brought online, the LSN is rolled forward, and then the database is allowed to accept transactions. No further restore operations are allowed after you recover a database by using the WITH RECOVERY option. When a restore operation uses the WITH NORECOVERY option, the database or filegroup state remains set to RESTORING. In this state, you can restore additional backups, such as differential and transaction log backups, to apply any changes that have occurred since the full backup was taken.
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Inside restore operations
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A restore operation can be a single step in which a full backup is restored and then the database is recovered and allowed to process transactions. However, in most production environments, a restore operation consists of multiple backup files that are restored one after another to place a database in a particular state and ensure recovery of the maximum amount of data. To accomplish this, the RESTORE command must enable the user to explicitly specify when the last restore operation has completed, and the database should be recovered and placed into service.
Lesson 2: Restoring a Database
Restoring a Differential Backup
To restore a differential backup, you must first restore a full backup while ensuring that the database is NOT recovered. The most recent differential backup is then applied to the database.
NOTE
Filegroup differential restore
The process for restoring a filegroup differential backup is very similar to restoring a differential backup. It requires that you execute a full filegroup restore first and that you do not recover the filegroup.
Consider the following example of this sequence of operations for a full backup followed by a differential backup:
RESTORE DATABASE PUBS FROM DISK = C:\DEMO\BACKUP\PUBSFULL.BAK WITH NORECOVERY RESTORE DATABASE PUBS FROM DISK = C:\DEMO\BACKUP\PUBSDIFF.BAK WITH RECOVERY
The first command restores the full backup, leaving the database unrecovered. The second command applies a differential backup and then recovers the database.
NOTE
Restoring a differential backup
The syntax to restore a full backup is the same as it is to restore a differential backup. SQL Server simply takes the extents from the differential backup and writes them into the database.
An example of this sequence of operations for a filegroup backup, along with a filegroup differential backup, is as follows:
RESTORE DATABASE AdventureWorks FILEGROUP = FG1 FROM DISK = C:\TEST\AWFG1.BAK WITH NORECOVERY RESTORE DATABASE AdventureWorks FROM DISK = C:\TEST\FG1DIFF1.BAK WITH RECOVERY
When restoring a differential backup to roll a filegroup restore forward, you do not need to specify the filegroup to which the differential is being applied. SQL Server automatically recognizes the filegroups that are in a RESTORING state as well as the extents within the differential backup that can be applied to the filegroup. Any extents that do not correspond to a filegroup that is in a RESTORING state are ignored.
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