题目

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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