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Which statements are true regarding table compression? （）(Choose all that apply.)
A:It saves disk space and reduces memory usage.
B:It saves disk space but has no effect on memory usage.
C:It incurs extra CPU overhead during DML as well as direct loading operations.
D:It incurs extra CPU overhead during DML but not direct loading operations.
E:It requires uncompress operation during I/O.

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出自：Oracle认证

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