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the database as soon as possible after a restore to a point in time or by restoring the database to the point of failure using the tail-log backup or to the most recent point possible. See Figure 15-2 for examples of these. (The types of backups are covered in 14.)
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Figure 15-1 Forked recovery path example.
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Log backup 2
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Figure 15-2 Avoiding forked recovery paths.
Restoring Data from Backups
You may need to restore data for various reasons. The most critical reason is to restore lost data, which may be a factor in the success or failure of a business. Here are some common scenarios in which you may restore data:
Part III
Microsoft SQL Server 2005 Administration
To restore data lost or corrupted because of a system failure To restore a database onto a development system for use by application developers while developing and testing new code To restore a database onto a test system to load test your applications or to test the use of certain database features in a controlled environment To restore a database onto a separate server as a read-only database that can be accessed by users to perform queries, such as for reports.
There are several ways to restore data, depending on the types of backups taken and the purpose of the restore. These are described in the following sections.
Complete Database, Differential Database, and Log Restores
A complete database restore is performed by restoring a full database backup. It restores all the files that existed in the database at the time of the backup. A differential database restore can be applied after its base complete database restore is performed with the NORECOVERY option. If multiple differential database backups have been taken since the full database backup, only the most recent differential backup needs to be restored. This is because each differential backup contains all changes since the base backup, not since the last differential backup. (In some cases there may not be a differential backup to apply, only log backups.) The following is the basic T-SQL syntax for a complete database restore or a differential restore operation:
RESTORE DATABASE <database_name> FROM <backup_device> WITH FILE = n, [RECOVERY | NORECOVERY];
The following is the basic T-SQL syntax for a log restore operation:
RESTORE LOG <database_name> FROM <backup_device> WITH FILE = n, [RECOVERY | NORECOVERY];
There are many options to both the RESTORE DATBASE and RESTORE LOG statements that may be of interest. For example, when performing a restore in a command prompt or with Query Editor, the STATS = percentage option will print the progress of the restore as the indicated percentage completes. The default is 10 percent. Please see SQL Server Books Online for usage of all possible arguments and options for the RESTORE command. A log restore applies a log backup by rolling forward transaction records. Multiple log backups may be applied one after the other as long as the NORECOVERY option is
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Restoring Data
specified. When the last log backup will be applied, use the RECOVERY option to recover the database and bring it online. Instead of using the logical backup device name in the FROM clause, you can list the physical file or files or tape drive path with DISK= or TAPE= options. The file number determines which backup file to apply. (Some methods for getting the file number follow.) If not specified in the WITH clause, the default is RECOVERY, meaning that the undo phase will occur, if necessary, and the database will be brought online. If the RECOVERY option is included but SQL Server determines that more data is needed to recover (such as a log backup when restoring a file that has changed since it was backed up), an error occurs and the database or file remains offline in a restoring state. Once the data has been successfully recovered (roll back has occurred and the data brought online), then no more backups can be applied. If the data has already been recovered, then to allow further backups to be applied you have to start the entire restore sequence again. Therefore, use the WITH NORECOVERY option if you need to apply other backups after restoring the database, such as a full database differential backup or log backups. The file number can be found by looking in the Management Studio Restore Database window in the Position column, as shown in Figure 15-3. To open the Restore Database window, complete the following steps: 1. In Object Explorer view, connect to the server instance of your choice, and then expand the server s Databases folder. 2. Right-click the appropriate database name.
Figure 15-3 Viewing file numbers in Management Studio (position column).
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