Explanation:
This command sets the fixed number of days that backups are held for media recovery. You can use the CONFIGURE command to specify a recovery window policy that establishes the number of days the backups are to be retained.
Incorrect Answers:
1: You can use the CONFIGURE RETENTION POLICY TO REDUNANCY number command to specify a redundancy policy that establishes the number of backups files and control files you want to retain.
2: It does not establish the fixed number of backups required to perform media recovery within 7 days. This command sets the fixed number of days that backups are held for media recovery.
4: This command does not ensure that sufficient backups and logs will be kept so that a point-intime recovery to any time in the last 7 days is possible.[/code] Reference:[/code] OCP Oracle9i Database: New Features for Administrators, Daniel Benjamin, p. 183-189[/code] Chapter 3: Manageability Enhancements[/code] Oracle 9i New Features, Robert Freeman, p. 79-86[/code] Chapter 3: New Oracle9i Availability and Recoverability Features

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