The image illustrates the concept of restoring and recovering a database from a backup, following a media failure. A backup of the database is taken at SCN 100. Media failure occurs at SCN 600. Redo logs spanning the period from SCN 100 to SCN 600 have been archived for use in recovery. The backup from SCN 100 is restored, or copied onto new media. The redo logs are used to recover the database, applying to the restored datafiles each change that occured between the backup and the point of media failure.