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Examine the following command：   SQL> ALTER TABLE booking SHRINK SPACE COMPACT；   Which activity is performed when the preceding command is executed？（）
A: The shrink operation touches every block in the BOOKING table
B: The high-water mark （HWM） for the BOOKING table is shifted from its original position
C: The progress of the shrink operation is saved in the bitmap blocks of the BOOKING table
D: The data manipulation language （DML） triggers on the BOOKING table are executed because the shrink operation is internally handled by the INSERT/DELETE operation

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出自：Oracle认证

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