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You upgraded Oracle Database 10g to Oracle Database 11g. How would this affect the existing users’ passwords？（）  
A: All passwords automatically become case-sensitive.
B: All passwords remain non-case-sensitive till they are changed.
C: All passwords remain non-case-sensitive and cannot be changed.
D: All passwords remain non-case-sensitive until their password attribute in the profile is altered.

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出自：Oracle认证

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