In general, RMAN supports most database backup features, including open or online
backups, closed database backups, incremental backups at the Oracle block level,
corrupt block detection, automatic backups, backup catalogs, and backups to
sequential media. RMAN added capabilities in Oracle9i for one-time backup configuration,
recovery windows to determine and manage expiration dates of backups,
and restartable backups and restores. Also added was support for testing of restores
and recovery.
Since Oracle Database 10g, RMAN can perform image copy backups of the database,
tablespaces, or datafiles. RMAN can be used to apply incremental backups to
datafile image backups. The speed of incremental backups is increased through a
change-tracking feature by reading and backing up only changed blocks.
Recovery options include the following:
??? Complete database recovery to the point of failure
??? Tablespace point-in-time recovery (recovery of a tablespace to a time different
from the rest of the database)
??? Time-based or point-in-time database recovery (recovery of the entire database
to a time before the most current time)
??? Recovery until the CANCEL command is issued
??? Change-based or log sequence recovery (to a specified System Change Number,
or SCN)
Backup and Recovery | 135
You can recover through RMAN, using either the recovery catalog or control file or
via SQL or SQL*Plus.
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