<{p}>30、Which four are true about duplicating a database using Recovery Manager(RMAN)<{/p}>

【多选题】
A A connection to an auxiliary instance is always required
B A connection to the target database instance is always required
C A subset of the target database can be duplicated
D A new DBID is always created for the duplicated database
E Duplication can be done by having the auxiliary database instance pull backup sets from the target database instance
F Duplication can be done by having the target database instance push copies to the auxiliary database instance
G A connection to the recovery catalog instance is always required
H A backup of the target database is always required.

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