Incremental backups can be either level 0 or level 1. A level 0 incremental backup, which is the base for subsequent incremental backups, copies all blocks containing data, backing the datafile up into a backup set just as a full backup would. 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:
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A differential backup, which backs up all blocks changed after the most recent incremental backup at level 1 or 0
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A cumulative backup, which backs up all blocks changed after the most recent incremental backup at level 0
Incremental backups are differential by default.
http://download.oracle.com/docs/ ... /b14192/bkup004.htm
应该没有看错吧。。。