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| Re: INCREMENTAL and CUMULATIVE backups [message #60454 is a reply to message #60440] |
Mon, 09 February 2004 04:06  |
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Mahesh Rajendran
Messages: 10708
Registered: March 2002
Location: oracleDocoVille
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Senior Member
Account Moderator |
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quoting the docs
An incremental backup reads the entire file and then backs up only those data blocks that have changed since a previous backup.
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 backup and a full backup is that a full backup is never included in an
incremental strategy. If no level 0 backup exists when you run a level 1 or higher backup, RMAN makes a level 0
backup automatically to serve as the base.
A level n incremental backup in which n is greater than zero backs up either:
All blocks changed after the most recent backup at level n or lower (the default type of incremental backup,
which is called a differential backup)
or
All blocks changed after the most recent backup at level n-1 or lower (called a cumulative backup)
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