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What is the purpose of the RMAN recovery catalog？（） 
A: It must be used because all RMAN-related backup and recovery metadata information is contained in it.
B: It provides a convenient， optional， repository of backup- and recovery-related metadata.
C: It provides the ability to store RMAN scripts for global use by any database that has access to the repository.
D: It provides a means of storing all RMAN backup sets physically in an Oracle database server. 
E: It provides the ability to store backup records for more than a year.

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出自：Oracle认证

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