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Which two statements about the background process of thedatabase writerare 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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出自：Oracle认证

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