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If you create your database using Oracle Managed Files （OMF）， what is true？（）
A:You must use Oracle predefined names to identify raw partitions that will hold OMF structures. 
B:You must define directories for two online redo log groups and three copies of the control file. 
C:If your CREATE DATABASE command fails, any OMF database files that have already been created will be dropped automatically. 
D:You must use only OMF data files when adding new tablespaces or data files to your database in the future.

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出自：Oracle认证

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