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Which statement describes the effect on an index， when the indexed column for the rows is updatedin the base table（）
A:An update in a leaf row takes place.
B:The index becomes invalid after the update.
C:The leaf block containing the row to be updated is marked as invalid.
D:A row in the leaf block of the index for the key value is logically deleted and a new leaf row is inserted

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出自：Oracle认证

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