ALL ABOUT RMAN

rman
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rman stands for recovery manager .
It is utility/tool to take backup,perform restore and recovery.
And also known as rman client.
rman executable is located at $ORACLE_HOME/bin.
when we type rman and hit enter it will internally call recover.bsq file.
Brain behain rman is recover.bsq which is located at $ORACLE_HOME/rdbms/admin.

Target Database:
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The database which is going to backup(source).

Backup Set
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It is a logical structure that contain one or more backup pieces.
Default one backup piece for one backup set.

Backup Piece
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It is a physical file or operating system file which containing the backup of datafile, archive redolog file and control file.

No  Catalog
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Default RMAN is configured in NO CATALOG Mode.
RMAN backup information will be stored in Controlfile.

Catalog
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Backup information stored in CATALOG that is seperate from TARGET database in the form of tables and views.Backup information also stored in controlfile.

Catalog Database
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In which catalog object will store.
Catalog objects are tables and views.

Catalog Owner
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Who owns the catalog object.

Degree of Paralism
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The number of channel that rman can open during backup or recovery.
Default is 1 Channel.

Backup Optimization
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rman doesnt perform a file backup if it has already backed up identical version of the file.

Image Copy
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Image copies are similar to the copies of operating system files.
We can make image copies of datafile, controlfile and archive redolog file.
Rman image copies can be made only to disk.
They can't be made to tape.

Proxy Copy
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rman can alos perform a special kind of backup called the proxy backup.
proxy copies cant be used to disks.