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Which statement is true about the PCTFREE setting for the table（）
A:It sets the minimum percentage of a data block to be reserved to contain chained rows from other blocks.
B:It sets the minimum percentage of a data block to be reserved as free space before the server prevents inserts into the block.
C:It sets the minimum percentage of a data block to be reserved to contain the bitmap used to maintain the free block information.
D:It sets the minimum percentage of a block that can be used for row data plus overhead before new rows are added to the block.

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出自：Oracle认证

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