ean 13 generator c# Figure 14-2 Scripting a backup operation. in Visual C#

Creator EAN-13 Supplement 5 in Visual C# Figure 14-2 Scripting a backup operation.

Figure 14-2 Scripting a backup operation.
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Partial Backup
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The partial backup capability is new for SQL Server 2005. Partial backup is entirely different than a differential backup, which we describe later in this chapter. Partial backup is mainly intended for use with read-only databases that use the simple recovery model; however, it also works with full and bulk-logged recovery models. The partial backup always backs up both the primary filegroup and any filegroups that are read-write. A read-write filegroup allows data modifications to the files in that filegroup, in contrast with a read-only filegroup, which allows only reads of that filegroup. Read-only filegroups are not backed up with a partial backup unless they are explicitly specified in the backup command. Note too that the primary filegroup cannot be individually set to read-only. To force the primary filegroup to read-only, you can set an entire database to read-only. Important The partial backup feature is intended for use with read-only databases using the simple recovery model. It is not the same as a differential backup. Partial backup still backs up entire filegroups, not just the changes, as the differential backup does. The main purpose of the partial backup is to provide a faster and smaller backup for databases with one or more read-only filegroups that have been backed up at least once within a full database backup or a full file backup and that have had no changes made to them (since they are read-only). Thus, those filegroups do not need to be backed up again. Therefore, once you have a full database backup, you can use the partial backup to back up only those filegroups that have changed. When you restore, you first restore the full database backup, then restore the partial backups. Since we are on the topic of read-only filegroups, here is how to set a filegroup to readonly using Management Studio: 1. Start SQL Server Management Studio. In Object Explorer view, connect to the server instance of your choice, and then expand the server s Databases folder. 2. Right-click the database name and select Properties on the shortcut menu. 3. Under Select a Page on the left, click Filegroups. 4. You will see a check box in the Read-Only column for filegroups other than Primary. Select the check box to set that filegroup to read-only, as shown in Figure 14-3. 5. Click OK to save the changes and close the Properties dialog box.
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If a filegroup is set to read-only, all the files in that filegroup are read-only. Use the following steps to set an entire database to read-only using Management Studio:
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Figure 14-3 Setting a filegroup to read-only.
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1. Start SQL Server Management Studio. In Object Explorer view, connect to the server instance of your choice, and then expand the server s Databases folder. 2. Right-click the database name and select Properties on the shortcut menu. 3. Under Select a Page at left, click Options. 4. Scroll down to the State section. 5. On the drop-down list next to Database Read-Only, select True to set the database to read-only, as shown in Figure 14-4. 6. Click OK to save changes and close the Properties dialog box. If the entire database is set to read-only, then it is appropriate to use the simple recovery model and perform a full database backup without performing differential or parital backups because no data is modified.
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Part III
Microsoft SQL Server 2005 Administration
Figure 14-4 Setting a database to read-only.
File and Filegroup Backup
As an alternative to performing a full database backup of the entire database at once, you can choose to backup only one file or filegroup at a time. This assumes that there are mutliple filegroups in the database (in addition to the primary filegroup). An individual file within a filegroup may be backed up, or an entire filegroup, which includes all the files within that filegroup, can be backed up. File or filegroup backups can be necessary when a database is so large that back up must be done in parts because it takes too long to back up the entire database at one time. Another potential benefit of having a file backup is that if a disk on which a particular file resides fails and is replaced, just that file can be restored, instead of the entire database. This is not a common scenario, but it can happen. See 10, Creating Databases and Database Snapshots, for more discussion about database file layout on disk. To ensure that you can restore a complete copy of the database when needed, you must have either a full database backup as a baseline or a complete set of full backups for each of the files and/or filegroups in the database. A complete set of file or filegroup backups is equivalent to a full database backup. If you do not have a full database backup and do not have a complete backup set of all files, then you will not be able to restore the entire database.
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