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- 单项选择题You work as a database administrator for Supportcenter.cn. 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
- A
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