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You work as a database administrator for Certkiller .com. Your database is configured for automatic undo management. UNDO_RETENTION is set to 3 hours. You want to flash back a table that was created last year. How far back can the flashback query go？ （）
A:3 hours
B:6 months
C:until last year
D:until last commit
E:until the point when the undotablespacewas refreshed
F:until the database is shut down and the memory erased

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出自：Oracle认证

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