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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When you use mirrored backups, SQL Server reads the page from the data files once and then creates multiple copies as it writes the page to disk or tape. This process has the effect of writing the same page of data to each mirror at the same time. The restriction on each mirror being of the same device type with similar properties is to ensure minimal performance impact when using this capability.
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A common misconception is that devices you are using for backups must be physically attached to the SQL Server machine. Backups can be sent to locally attached devices. You can also send backups to a Universal Naming Convention (UNC) path. When sending backups to a UNC path, you must consider the backup s impact on the network bandwidth.
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The following example backs up the PUBS database to a two-disk media set and creates three mirrors of the backup. The first backup occurs to a locally attached disk, whereas each of the mirrors is a network resource accessed via a UNC path.
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BACKUP DATABASE PUBS TO DISK= C:\DEMO\BACKUP\PUBS1B.BAK , MIRROR TO DISK= \\BAKSERVER1\BACKUP\PUBSMIRROR1A.BAK , PUBSMIRROR1B.BAK MIRROR TO DISK= \\BAKSERVER2\BACKUP\PUBSMIRROR2A.BAK , PUBSMIRROR2B.BAK MIRROR TO DISK= \\BAKSERVER3\BACKUP\PUBSMIRROR3A.BAK , PUBSMIRROR3B.BAK WITH FORMAT GO DISK= C:\DEMO\BACKUP\PUBS1B.BAK DISK= \\BAKSERVER1\BACKUP\ DISK= \\BAKSERVER2\BACKUP\ DISK= \\BAKSERVER3\BACKUP\
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The FORMAT clause is normally an optional parameter. This parameter writes a new media header to each media set, overwriting the previous header and invalidating any other backups contained on the media. However, the FORMAT clause is required for a mirrored backup.
Partial Backups
It is possible to have databases in which some of the filegroups can be written to, whereas others are read-only. In previous versions of SQL Server, a full backup captured all allocated extents in a database, even when a filegroup was marked as readonly, which meant that there were no changes to the data. SQL Server 2005 introduces an additional parameter to the BACKUP command to handle this situation. The READ_WRITE_FILEGROUPS clause causes the backup engine to skip any filegroups that are marked as read-only, saving time and space in the backup by having the backup engine gather only the set of extents that could change.
Lesson 1: Backing Up a Database
An example of a statement to execute a partial backup is the following:
BACKUP DATABASE PUBS READ_WRITE_FILEGROUPS TO DISK= C:\DEMO\BACKUP\PUBS1.BAK
PRACTICE
Backing Up a Database by Using Full/Differential/Transaction Log and Filegroup/Filegroup Differential/Transaction Log Backups
In this practice, you will create backups for the AdventureWorks database using two different methods: full/differential/transaction log and filegroup/differential/transaction log.
Practice 1: Back Up a Database by Using Full, Differential, and Transaction Log Backups
In this practice, you will back up the AdventureWorks database by using a series of full, differential, and transaction log backups. 1. Launch SSMS, connect to your SQL Server instance, and open a new query window. 2. Create a directory named c:\test. 3. Execute the following command to create a full database backup:
BACKUP DATABASE AdventureWorks TO DISK = C:\TEST\AW.BAK
4. Make a change to the Production.Product table in the AdventureWorks database. 5. Execute the following command to back up the transaction log and capture the change you just made:
BACKUP LOG AdventureWorks TO DISK = C:\TEST\AW1.TRN
6. Make another change to the Production.Product table. 7. Execute the following command to perform a differential backup of the database:
BACKUP DATABASE AdventureWorks TO DISK = C:\TEST\AWDIFF1.BAK WITH DIFFERENTIAL
8. Make another change to the Production.Product table. 9. Execute the following command to perform a full database backup to the specified disk location:
BACKUP LOG AdventureWorks TO DISK = C:\TEST\AW2.TRN
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Backing Up, Restoring, and Moving a Database
Practice 2: Back Up a Database by Using Filegroup, Filegroup Differential, and Transaction Log Backups
In this practice, you will add a second filegroup to the AdventureWorks database and then perform a series of full filegroup, differential filegroup, and transaction log backups. 1. If necessary, launch SSMS, connect to your SQL Server instance, and open a new query window. 2. If necessary, create a directory named c:\test. 3. Execute the following batch to add the filegroup FG1:
ALTER DATABASE [AdventureWorks] ADD FILEGROUP [FG1] GO ALTER DATABASE [AdventureWorks] ADD FILE ( NAME = AW1DATA, FILENAME = C:\TEST\FG1.NDF , SIZE = 5MB) TO FILEGROUP [FG1] GO --Now, create a testing table on the filegroup. CREATE TABLE dbo.t1 ( id INT , v CHAR(1000) DEFAULT bbbb , ) ON [FG1] GO
4. To perform a full filegroup backup, execute the following command:
BACKUP DATABASE AdventureWorks FILEGROUP = PRIMARY TO DISK = C:\TEST\AWPRI.BAK go BACKUP DATABASE AdventureWorks FILEGROUP = FG1 to disk = C:\TEST\AWFG1.BAK go
5. Insert a row of data into the dbo.t1 table. 6. To perform a transaction log backup of the database, execute the following command:
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