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Database restoration is the process of overwriting an offline database with a version stored in a backup file or set of files. Database recovery, in contrast, occurs after resto ration and is the process of bringing the database online after establishing consis tency. The restore sequence is the order of restore operations that you perform before recovering a database; this restore sequence depends in large part on the database s recovery model.

After this lesson, you will be able to:

Describe the difference between Simple, Full, and Bulk-Logged recovery models. Describe the restore sequence of a database set to Simple, Full, or Bulk-Logged recovery models. Describe some of the elements required in a written disaster recovery plan. Restore and recover a database set to the Full recovery model.

In SQL Server, a recovery model is a property of a database that defines how transac tions are logged, whether the transaction log can be backed up, and (indirectly) how a database should be restored. Three recovery models are available: Simple, Full, and Bulk-Logged.

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In the Simple recovery model, the transaction log is not backed up, and data is recov erable only to the most recent full, differential, partial, or file backup. For a user data base, the Simple recovery model is generally useful for test and development databases and for databases containing mostly read-only data (such as a data ware house). The Simple recovery model is inappropriate for production systems in which loss of recent changes is unacceptable. You cannot perform transaction log backups in the Simple recovery model because SQL Server clears the log as soon as it commits transactions. Because transaction log backups are not permitted, the backup and restore process is simplified. However, without transaction log backups, recovering to the point of failure is not possible.

Databases using the Simple recovery model minimally log certain bulk operations. This is a signifi cant behavior switch from SQL Server 2000. To read more about which operations are minimally logged in the Simple recovery model (and the Bulk-Logged recovery model), see the subsection titled Bulk Operations later in this chapter.

Note If you want to continue experimenting with the Windows Performance Toolkit profiling capabilities, consult the tutorials that ship with the toolset. Among other things, you ll learn how to profile actual applications and see symbols and call stacks, how to diagnose the system boot process, and many other fascinating performance disciplines.

Restore Sequence (Simple Recovery Model) For a database set to the Simple recovery model at the time of the last backup operation, a restore sequence involves only one or two steps because there are no transaction log backups to apply. The number of steps in the restore sequence thus depends merely on whether you have performed a differential backup since the last full backup.

If you have not performed a differential backup since the last full backup, simply restore the most recent full backup by using the RESTORE DATABASE statement and the WITH RECOVERY option. If you have performed a differential backup since the last full backup, the restore sequence consists of the following two steps: 1. Restore the most recent full backup and specify the WITH NORECOVERY option. 2. Restore the full differential backup and specify the WITH RECOVERY option.

In all restore sequences, use the WITH NORECOVERY option when you want to restore more backups after the current restore operation has completed. Use the WITH RECOVERY option only to restore the final backup. This latter option brings the database online and prevents you from restoring any subsequent backups.

Technically speaking, you do not actually base a restore process on a recovery model; instead, you base a restore process merely on the backups you have available. Backups are created in response to recovery requirements of the organization, and those requirements dictate the recovery model to be used.

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The Full recovery model fully logs all transactions and enables you to perform trans action log backups. This model also retains all transaction log records until they are backed up. Because the Full recovery model includes transaction logs backups, it enables you to recover a database to the point of failure (provided that you can back up the tail of the log after the failure). You should use the Full recovery model with most read-write databases because it minimizes data loss exposure.

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