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Which of the following options describes Segment Shrink？（）  
A: Reclaims space above and below the high-water mark without using additional space
B: Moves rows to a new physical location，resetting the high-water mark，but uses additional space during the operation
C: Deallocates space above the high-water mark that is currently not in use
D: None of the above

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出自：Oracle认证

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