Shulou(Shulou.com)06/01 Report--

RMAN> CONFIGURE RETENTION POLICY TO REDUNDANCY 7;

RMAN> CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF 7 DAYS;

The two backup retention policies are mutually exclusive, with the later configured overriding the former.

Understanding:

Redundancy can be understood as a physical policy, which is easy to understand is to set it to have several backups.

Recovery Window can be understood as a logical policy. If it is set to 7 days, it will ensure that the backups required for recovery to 7 days are available at any point in time.

The specific effect depends on your specific backup strategy. For example, if you backup once a day, then Redundancy=7 can be restored to 7 days.

One is considered quantitatively (redundancy)

A thing is considered in terms of days (recovery window)

If you backup 7 times a day and use Redundancy=7, it is impossible to restore it to the day before yesterday.

window is time-based, a window of time beyond which delete obsolete runs will be deleted.

redundancy means redundancy, beyond which redundancy will be deleted as an expired backup when delete obsolete is run

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