Incremental backup:

Incremental backup:
增量备份：>0
差量备份：>=0
Makes a copy of all data blocks that have changed since aprevious
backup. The Oracle database supports two levels of incrementalbackup (0 and 1). A

level 1 incremental backup can be one of two types: cumulativeordifferential. A

cumulative backup backs up all changes since the last level 0backup. A differential

backup backs up all changes since the last incremental backup(which could be either a

level 0 or level 1 backup). Change Tracking with RMAN supportsincremental backups.

eg
Y ou perform dif ferential incremental level1 backups of yourdatabaseon each working

day and level  0 backup  on Sundays,  to  tape. 
1.The  backup performed  on Monday  contains all  the blocks  that have  changed  

since  the level  0 backup, and  every other  working day  contains all  the  

blocks  that have  changed since  the level  1 backup.
2.The  backup performed  on Sundays  contains all  the blocks  that have  ever  

been  used  in the database.