When do the DBWR writes the data into the data files ?

1.If there are no free buffers.

2.Number of buffers reaches a threshold volume.

3.When timeout occurs.

4.Whenever we try to make the tablespace offline.

5.Whenever we try to make the tablespace read-only.

6.Whenever we try to drop the table.

7.Whenever we issue truncate command.

8.Whenever we keep the table space in the "begin backup mode".