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多选题
Which 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 onlineredo log files
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