rman backup incremental

Multilevel Incremental Backups

RMAN can create multilevel incremental backups. Each incremental level is denoted by a value of 0 or 1.

A level 0 incremental backup, which is the base for subsequent incremental backups, copies all blocks containing data.

The only difference between a level 0 incremental backup and a full backup is that a full backup is never included in an incremental strategy.

A level 1 incremental backup can be either of the following types:

■ A differential backup, which backs up all blocks changed after the most recent incremental backup at level 1 or 0

■ A cumulative backup, which backs up all blocks changed after the most recent incremental backup at level 0Incremental backups are differential by default.

The size of the backup file depends solely upon the number of blocks modified and the incremental backup level.

Note: Cumulative backups are preferable to differential backups  when recovery time is more important than disk space, because

fewer incremental backups need to be applied during recovery.

Incrémental  différentiel  de level 1   :

Backup   incremental  level  cumulatif :

On  backup  tout  depuis   le  backup full  tous  les jours.

On peut  évidemment  faire un mix