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Figure 4-3: The logical architecture of Human brain. Working of
Oracle Instance resembles with the working of Human Brain.
The sources of input to the Brain are our five senses similarly the
sources of input to the Oracle Instance are connected users and
their requests. Human brain interacts with the external world
utilizing those five senses. Background processes receive inputs
from these five senses and based on the request, interacts with
the memory and sends the output or the “decision”.
For example, you must have noticed, if you come across a very
old friend that you last met 15 or 25 years ago. You saw him and
he saw you in a shopping mall. Both of you will stop and say in
astonishment, “I am feeling difficult in recalling but I must have
seen you somewhere”. That's the point where one of the
background processes in brain is busy searching the
memory/dictionary/library (or whatever you name it) to pull up
the record/information about that person. And after few seconds
you say, “David, my old Kindergarten friend”. He says, “Wait a
minute …”. “Julie, good to see you after a long time”.
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