In many ways, database server architecture is treated as a mere afterthought. It's often much easier to simply create a single node, install some software, and consider the whole affair resolved. If a company is particularly paranoid, they may even spare some thought for a replica server, or perhaps some kind of backup.
The true importance of database cluster architecture is easily overlooked as a result. But what is server architecture? Why does it matter?
Look down the street. Any street is fine. What do you see? Homes, offices, and buildings of various descriptions. With very rare exceptions, each one of these was meticulously planned, from the foundation to the walls to the electrical wires, pipes, up to the roof and drainage systems. A failure in any of these components could lead to the ultimate demise of the entire structure, given enough...
