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This will update the references to the new machine name and should not cause any loss of data. Use this procedure if changes to the machine name are required, but beware of undesired effects on scripts, client applications, and users that use this machine name.
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In this section, we ll focus on the ways you can recover from failures in your SQL Server 7 installation. As we discussed in earlier chapters, many types of data loss can be attributed to user error. A common example is a user executing a DELETE query with an incorrect or missing WHERE clause. In this case, so much data might be lost that a restoration from backup is required. It is important to remember, however, that recovering a lost or corrupted database might only be part of the picture. In addition to recovering database information, you might need to recover your OS. We covered ways to recover data and programs on installations of SQL Server 7 in 3, Data Protection in Windows NT/2000. In that chapter, the basics of fixing situations in which the machine will not boot, reinstalling the OS, and providing for fault-tolerance were described. Be sure you understand those processes, because recovering SQL Server 7 databases is not very useful if your Windows 2000 Server installation is corrupt! Building on the recovery mechanisms covered previously, let s start to look at the actual operations that might be required to recover information stored in SQL Server 7 databases and objects.
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Although we often use the following terms interchangeably, there is a difference in SQL Server terminology: w v Restoration An operation that copies data from a valid backup file to a new or existing database Recovery The process of bringing a database server back online to a consistent point in time
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In general, your restoration operations will likely perform both tasks. In the simplest case, a restoration of a database from a full backup is made. Immediately after the data is restored, a recovery is performed, leaving the database in a usable state and ready to accept client connections. That covers the basics of using full backups, but what about more complex scenarios involving file, filegroup, and transaction log backups In these cases, you ll want to perform all of your data restoration operations first. The last operation will bring the database back online by performing a recovery. A recovery rolls back any transactions that were not committed in the database at the completion of the backup and rolls back any other operations. The end result is a consistent database that is ready for use. For example, assume that we have a database that was backed up using the following operations:
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Recovering the Data
w s v
Full backups every Sunday evening Differential backups completed on weeknights, Monday through Saturday, at 9:00 P.M. Transaction log backups performed every hour between the hours of 9:00 A.M. and 6:00 P.M.
Assuming a complete loss of the database occurs on Thursday at 11:53 A.M., we ll need to restore from several backups and then recover the database to bring it back online. The exact sequence of steps is as follows: 1. Restore from the full database backup. 2. Restore differential backup from Wednesday. 3. Restore transaction log backups from 9:00 A.M. and 10:00 A.M. 4. Restore the transaction log backup from 11:00 A.M. with recovery. Figure 7-3 illustrates the database restoration and recovery operations required to bring this installation back online to the latest point in time allowable by the backups. When performing a backup, SQL Server also provides the ability to save an undo log file to disk. This file is used mainly for the purpose of establishing and maintaining standby servers (a topic we ll cover in 8, Advanced Data Protection Tactics ). Fortunately, as we ll see later in this chapter, the tools and utilities included with SQL Server 7 can make these complex operations much easier to manage. Now that we have an overview of the processes involved, let s move on to look at how we can use the specific backup types.
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