多选题
You work as a database administrator for Certkiller .com. You are using Recovery Manager （RMAN） to perform backups in your databases. Which four backup operations can be performed using RMAN？（）
发布日期：2020-04-10
A backup of the target database when it is mounted
A backup of online redo log files when the database is open
A backup of only used data blocks in the file beingbeingbackup up
A backup of online， read/write data files when the database is open
A backup of only those data blocks that have changed since a previous backup
A backup of online， read/write data files when the database is in the NOMOUNT state.
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