What Types of processes that run in Oracle?

   1.      User Processes

-        Created when an application or tool code needs to run

   2.      Server Processes

-        Created by oracle to execute a user process

   3.      Background processes(BG)

-        Some of the BG processes are started when the server started and other as per required.

   4.      Oracle Daemons and application processes not limited to the specific dB

-        The grid infrastructure and networking processes fall into this category, these are server level.