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The flash recovery area isn t mandatory, but it s highly recommended. Some features of Oracle database backup and recovery, such as Oracle Flashback Database, require the use of a flash recovery area. You don t need to store all your backup-related files here, although that s what Oracle recommends.
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To enable Automatic Disk-Based Backup and Recovery, you have to designate enough disk space for the flash recovery area, set the maximum size for the area, and tell Oracle how long you want to keep backup-related information. Oracle then manages the backup, including archive log files, control files, and other files (your redundancy set will be part of this set of files). Oracle also deletes any files not needed by your database. Therefore, all you have to do is provide enough space for the flash recovery area and select an appropriate length of time for keeping files. To delete unwanted files automatically, the Oracle database relies on the Oracle Managed Files (OMF) system. The OMF system automates Oracle database file management by creating and managing the database files that are part of the operating system. To set up an OMF file system, set the following OMF-related initialization parameters: DB_CREATE_FILE_DEST and DB_CREATE_ONLINE_LOG_ DEST_n. OMF has the ability to create and delete Oracle files without the DBA s intervention. RMAN uses this OMF capability in its backup- and recovery-related functions in conjunction with the flash recovery area. If you want, you can use a flash recovery area with an ASM file system. 17 provides details on OMF and ASM file systems.
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You can share a flash recovery area among multiple databases.
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CHAPTER 15 BACKING UP DATABASES
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Benefits of the Flash Recovery Area
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Following are the key benefits of using the flash recovery area: It acts as a central storage area It allows you to automatically manage recovery-related disk space It allows you to carry out backup and restore operations more quickly Backups have an increased reliability, because disks are safer storage devices than tapes Because you are no longer restoring tape backups, backup and restore operations are quicker. Even the backups moved to tape from the flash recovery area are retained on disk as long as there is room in the flash recovery area. Backup files that become obsolete per your recoverability goals will be automatically deleted when space is needed for new files.
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Ideally, the flash recovery area holds a full backup of every data file, your incremental backups, control file backups, and every archived redo log that is required for media recovery. In addition, you can use the flash recovery area as a disk cache for tape. If you configure a flash recovery area, RMAN will store all the backup-related files in it by default. In this case, Oracle will use OMF files and generate the filenames. The flash recovery area can contain the following: Data file copies: The RMAN BACKUP AS COPY command creates image copies of every data file. The RMAN will in turn store these in the flash recovery area. You can also store RMAN backup pieces in the flash recovery area. (An RMAN backup piece is an operating system file containing the backup of a data file, a control file, or archived redo log files.) Incremental backups: If your backup strategy includes any incremental backups, they can be stored here. Control file autobackups: The flash recovery area is the default area for all control file autobackups made by RMAN. Archived redo log files: Oracle automatically deletes every obsolete file and every file that has been transferred to tape, so the flash recovery area is the ideal place to store archived redo log files. Online redo log files: Oracle recommends that you save multiplexed copies of the online redo log files in the flash recovery area. Oracle generates its own names for these files. Current control files: You should also store a multiplexed copy of your current control file in the flash recovery area. Flashback logs: The Oracle Flashback Database feature, which provides an convenient alternative to traditional PITR, generates flashback logs. Oracle stores the flashback logs in the flash recovery area. The Flashback Database feature (discussed in 16), if enabled, copies images of each altered block in every data file into the flashback logs in the flash recovery area. The multiplexed redo log files and control files contained in the flash recovery area are called permanent files, since you should never delete them (if you did, your instance will eventually crash as a result). The other files in the flash recovery area (recovery-related files) are transient files, because they ll be deleted after they are obsolete or have been copied to tape. The transient files include archived redo logs, data file copies, control file copies, control file autobackups, and backup pieces.
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