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Which two statements are true about checkpointing（）
A:The checkpoint frequency decreases with the smaller redo log file size.
B:It ensures that all committed data is written to the data files during normal shutdown.
C:The frequent full checkpoint in a database can cause the overall degradation of the database performance.
D:It prompts the Checkpoint （CKPT） process to write data to the data files and redo information to the online redo log files.

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出自：Oracle认证

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