User Process
Listener
Server Process
PGA
ORACLE INSTANCE
SGA
-
DB Buffer Cache
-
Redo Log Buffer
PMON
SMON
DBWn
CKPT
LGWR
ARCn
data files
controlfile1.ctl
controlfile2.ctl
control files
Disco A
LOG1_A
LOG2_A
Disco B
LOG1_B
LOG2_B
redo log files
archived log files
ARC_01
parameter-file
undo
Oracle Database
Client
Server