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How does RMAN back up and restore files in Oracle?
RMAN commands use the recovery catalog metadata to behave transparently across different physical databases in the Oracle Data Guard environment. For example, you can back up a tablespace on a physical standby database and restore and recover it on the primary database.
Can a RMAN Restore be executed on a production instance?
WARNING: Execute rman restore commands only on a test instance. If you try these restore commands in a production instance, and if something goes wrong, you’ll lose your production data. First, you may want to restore the control file from the backup before you start the restore.
Can a control file be used as a RMAN repository?
It is not sufficient to use only the control file as the RMAN repository because the primary database has no knowledge of backups taken on the standby database. The RMAN recovery catalog organizes backup histories and other recovery-related metadata in a centralized location.
What does RMAN mean for database point in time recovery?
RMAN can perform recovery of the whole database to a specified past time, SCN, or log sequence number. This type of recovery is sometimes called incomplete recoverybecause it does not completely use all of the available redo. Incomplete recovery of the whole database is also called database point-in-time recovery (DBPITR).
Is there a way to backup and restore an Oracle Database?
There are basically two ways to perform a data backup in Oracle: Oracle provides a powerful utility to back up and restore databases, which is known as Oracle Recovery Manager (RMAN). We can use RMAN to back up databases as a complete backup or incremental backup.
How to back up files in Oracle Data Guard?
12.1.2Association of Backups in an Oracle Data Guard Environment The recovery catalog tracks the files in the Oracle Data Guard environment by associating every database file or backup file with a DB_UNIQUE_NAME. The database that creates a file is associated with the file.
How to delete obsolete backups in Oracle DBA?
Note: Selecting to retain full backups for each data file as 1 (the default value) will mark the older backups as obsolete whenever a new backup is taken, i.e., only one backup will be retained at a time. Later, we can delete the obsolete backups using the following command: