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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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