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2018年的时候，OCP 11g考试题库大更新，052 053出现了很多新题，
2019年，11g即将停考的前期，Oracle又出现了一次大变动，12c出现了很多新题，比如062 063题库大更新
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39题、choose two
You configured the Fast Recovery Area (FRA) for your database. The database instance is in ARCHIVELOG mode. The default location for the archived redo log files is the FRA.
Which two files are removed automatically if space is required in the FRA as per the retention policy?
A) user-managed backups of data files and control files
B) flashback logs
C) RMAN backups that are obsolete
D) archived redo log files that have multiple copies in a different archive location
Answer：BC
(解析：闪回区里面的数据如果是rman备份的数据，那么会根据冗余策略自动删除;还有闪回日志的保留时间由db_flashback_retention_target产生指定，如果超过了时间，则会自
动删除。)
