Database Reference
In-Depth Information
We will talk in detail regarding Figure 4-7 in the next chapter as
it literally shows Oracle in action under shared server mode.
In Figure 4-7 you can see pictorially the sentence we used to
define oracle instance i.e. the background processes and memory
architecture constitute the instance. LGWR (Log Writer
Process), PMON (Process Monitor), SMON (System Monitor),
ARCn (Archiver Process) etc. are all Oracle background
processes and SGA in the center is the memory architecture of
Oracle.
So all these background process utilize the memory architecture
(shared area) to fulfill requests of all the connected users or in
other words Oracle Instance fulfills the requests of all the
connected users.
The Figure 4-8 shows the same thing as the previous one but
here you might have noticed that we have less number of blocks,
especially there is no Dispatcher process and no Request and
Response Queue. This is because; here we are showing Oracle
working in Dedicated Server mode.
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