（多选题）
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.
正确答案
答案解析
略
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