Some developers have already asked why there are a dozen processes being created when CUBRID is started. Being one of the core developers of CUBRID Database and creator of CUBRID Cluster project, the author thought it was his duty to explain CUBRID processes and the communication between each of them. The article is very easy to understand. It is a part of a book the author is writing called "CUBRID Internals". The author also compares CUBRID processes with those of MySQL and Oracle.