What is a differential incremental backup?
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What is a differential incremental backup?
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A differential incremental backup is a type of incremental backup that backs up all data blocks that have changed since the most recent incremental backup at level n or lower. For example, in a level 2 differential incremental backup, the Recovery Manager (RMAN) determines which level 2, level 1, or level 0 backup is most recent and then backs up all data blocks changed since that backup. A differential incremental backup, also called a non-cumulative incremental backup, is the default type of incremental backup. When performing a recovery by using differential incremental backups, one or more backups at each level must be applied.
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