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多选题
Which two statements about the background process of the database writer are true（）
A
It is possible to have multiple database writers in an Oracle instance.
B
It writes dirty buffers， if any， to data files whenever a checkpoint occurs.
C
It writes dirty buffers， if any， to data files whenever a transaction commits.
D
It writes dirty buffers， if any， to data files before the log writer （LGWR） writes
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