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