Backup and Recovery 101
Darl Kuhn, Sam R. Alapati, Arup Nanda · Apress eBooks · 2013
Oracle backup and recovery refers to the theory and practice of protecting a real-life Oracle database against data loss and recovering data after a loss. You can lose data either because of a technical problem, such as media failure, or because of errors made by the users, such as a wrong update or an overeager sysadmin or DBA deleting the wrong file. Oracle backup is the set of concepts, strategies, and steps to make copies of a database so you can use them to recover from a failure/error situation. Backups in this sense refer to physical backups of database files, control files, and archived redo log files. Oracle recovery is the set of concepts, strategies, and steps to actually recover from a system/user error or a potential data loss due to media-related problems, such as the loss of a disk drive.