Answer Posted / milentechie

The DBWn background process writes to the datafiles
whenever one of the following events occurs:
 A user’s Server Process has searched too long for a free
buffer when reading a buffer into
the Buffer Cache.
 The number of modified and committed, but unwritten,
buffers in the Database Buffer
Cache is too large.
 At a database Checkpoint event. See Chapters 10 and 11
for information on checkpoints.
 The instance is shut down using any method other than a
shutdown abort.
 A tablespace is placed into backup mode.
 A tablespace is taken offline to make it unavailable or
changed to READ ONLY.
 A segment is dropped.

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