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Examine the backup requirement for your company: 1) Every Sunday, a backup of all used data file blocks is performed. 2) Every Wednesday and Friday, a backup of all the changed blocks since last Sunday's backup is performed. 3) On all the other days, a backup of only the changed blocks since the last day's backup is performed. Which backup strategy satisfies the requirements?
Correct Answer: A
Explanation/Reference: Explanation: Multilevel Incremental Backups RMAN can create multilevel incremental backups. Each incremental level is denoted by a value of 0 or 1. A level 0 incremental backup, which is the base for subsequent incremental backups, copies all blocks containing data. You can create a level 0 database backup as backup sets or image copies. 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. Thus, an incremental level 0 backup is a full backup that happens to be the parent of incremental backups whose level is greater than 0. A level 1 incremental backup can be either of the following types: A differential incremental backup, which backs up all blocks changed after the most recent incremental backup at level 1 or 0. A cumulative incremental backup, which backs up all blocks changed after the most recent incremental backup at level 0. Incremental backups are differential by default.