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What purpose would you achieve by enabling the block change tracking feature？（）
A: Eliminate the necessity for backups.
B: Perform optimized image copy backups.
C: Perform optimized incremental backups.
D: Enable checkpoint （CKPT） to perform checkpointing at every block change.
E: Enable database writer （DBWn） to write changed blocks to data files faster.

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出自：Oracle认证

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