RMAN in Oracle Database 10g improved the reliability of backups and restores
through a number of added features. This version added backup and restore of
standby control files. RMAN now can automatically retry a failed backup or restore
operation. During recovery, RMAN can automatically create and recover datafiles
not in the most recent backup. Where backups are missing or corrupt during the
restore process, RMAN automatically uses an older backup.
To speed backups and restore operations, Oracle Database 10g introduced the Flash
Recovery Area, thus organizing recovery files to a specific area on disk. These files
include a copy of the control file, archived log files, flashback database logs, datafile
copies, and RMAN backups. You can set a RETENTION AREA parameter to retain
needed recovery files for specific time windows. As backup files and archivelogs age
beyond the time window, they are automatically deleted. ASM (described earlier in
this chapter) can configure the Flash Recovery Area. If availability of disk space is an
issue, you can also take advantage of RMAN??™s ability to compress backup sets.
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