RMAN Backup of Database

How to take RMAN backup with and without incremental level.

RMAN INCREMENTAL BACKUP LEVEL 0

$ rman target /
RMAN> show all;
RMAN>
run
{
allocate channel ch1 type disk;
allocate channel ch2 type disk;
backup incremental level 0 database format '/path/%d_%T_%t_%s_%p.dbf';
backup archivelog all format '/path/%d_%T_%t_%s_%p.arc' not backed up 1 times;;
backup current controlfile format '/path/%d_%T_%t_%s_%p.ctl';
release channel ch1;
release channel ch2;
}
RMAN>

RMAN INCREMENTAL BACKUP LEVEL 1

$ rman target /
RMAN> show all;
RMAN>
run
{
allocate channel ch1 type disk;
allocate channel ch2 type disk;
backup incremental level 1 database format '/path/%d_%T_%t_%s_%p.dbf';
backup archivelog all format '/path/%d_%T_%t_%s_%p.arc' not backed up 1 times;
backup current controlfile format '/path/%d_%T_%t_%s_%p.ctl';
release channel ch1;
release channel ch2;
}
RMAN>


RMAN BACKUP OF DATABASE (WITHOUT USING LEVEL 0)

$ rman target /
RMAN> show all;
RMAN>
run
{
allocate channel ch1 type disk;
allocate channel ch2 type disk;
backup database format '/path/%d_%T_%t_%s_%p.dbf';
backup archivelog all format '/path/%d_%T_%t_%s_%p.arc;
backup current controlfile format '/path/%d_%T_%t_%s_%p.ctl';
release channel ch1;
release channel ch2;
}
RMAN>

NOTE:-

If you have taken the RMAN full backup using the command ‘Backup database’, where as a level 0 backup is physically identical to a full backup. The only difference is that the level 0 backup is recorded as an incremental backup in the RMAN repository so it can be used as the parent for a level 1 backup. Simply the ‘full backup without level 0’ can not be considered as a parent backup from which you can take level 1 backup.


Incremental backup levels:-

Level 0 – full backup that can be used for subsequent incrementals
RMAN> backup incremental level 0 database;

Differential Level 1–only the blocks that have changed since the last backup (whether it is level 0 or level 1)
RMAN> backup incremental level 1 differential database;

Cumulative Level 1 – all changes since the last level 0 incremental backup
RMAN> backup incremental level 1 cumulative database;

A full backup cannot be used for a cumulative level 1 backup.
A cumulative level 1 backup must be done on top of an incremental level 0 backup.