The image cncpt154.gif shows the SGA in the middle. Above it are arrows going back and forth to the RECO, PMON, and SMON processes. Beneath it are arrows going from the buffer cache to the DBW0 process and from the redo log buffer to the LGWR process. The DBW0 process also shows an arrow going to datafiles, and the LGWR process also shows an arrow going to the redo log files.
This illustration also includes some other processes, such as ARC0, with an arrows going to offline storage devices and control files, and CKPT, with an arrow going to datafiles.