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Your database is configured on non-ASM disk storage. You need to migrate your database to ASM disk storage.  Which statement is true about migrating from non-ASM disk storage to ASM disk storage？（） 
A: You can use the operating system utility to migrate from non-ASM disk storage to ASM disk storage.
B: You cannot perform a database backup from non-ASM disk storage to tape and then move it to ASM disk storage.
C: You can use the SWITCH DATABASE TO COPY Recovery Manager （RMAN） command to switch back to non-ASM disk storage if you have not deleted your original datafiles.
D: You cannot use Recovery Manager （RMAN） to migrate from non-ASM disk storage to ASM disk storage if you are not using RMAN for your backup and recovery strategies.

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出自：Oracle认证

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