Answer Posted / ankur akash

'Database buffer cache' is a part of SGA [Shared Global
Area] architecture.

The default parameter is db_buffer_Cache
Starting from Oracle 10G DB, to determine database buffer
size, the parameter is, db_nk_buffer_Cache
where n=2,4,8,16,32 [8k is the default one].

Database buffer cache is a virtual passage where data is
inserted from 'Most recently used' and will move forward in
the queue towards the 'least recently used' end.

The buffers are named as empty, pinned and dirty.

Once the data gets committed 'DBWn' will write the data from
the database buffer cache to the file on disk.

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