"In this article, we're going to take a look at MySQL internals.
It will be a fun, informative examination of how all the different
pieces and parts of the MySQL server operate together. MySQL's
implementation is a fascinating mix of technology that is truly a
remarkable achievement—an achievement born from the sweat and
inspiration of numerous developers over many years.
"One of the joys of open-source technology is just that: it's
open source! On a system as large as MySQL, taking a look at the
source code gives you a true understanding of the dilemmas faced by
the developers over the course of the software evolution..."