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Which two statements are true regarding Health Monitor checks in Oracle Database 11g？（）  
A: Health Monitor checks can be used to scan the contents of the redo log and archive logs for accessibility and corruption.
B: Health Monitor checks can be used to verify the integrity of database files and report failures if these files are inaccessible，corrupt or inconsistent.
C: Health Monitor checks can be used to verify the contents of dictionary entries for each dictionary object and fix it automatically.
D: Health Monitor checks are always initiated manually when there is some critical error.

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出自：Oracle认证

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