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Which two statements are true about the Automatic Diagnostic Repository （ADR）？（） 
A: The ADR base keeps all diagnostic information in binary format
B: SQL*Plus provides the ADRI script， which can be used to work with ADR
C: The ADR can be used for problem diagnosis only when the database is open
D: The ADR can be disabled by settting the DIAGNOSTIC_DEST parameter to null
E: The ADR can be used for problem diagnosis even when the database instance is down
F: The ADR base is shared across multiple instances

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出自：Oracle认证

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