Load balancing / APIs / latency / replicating data is usually handled at OS level (drivers, 'database as an os', traditional 'os', 'caching', memory,hard drive,

Load balancing / APIs / latency / replicating data is usually handled at OS level (drivers, 'database as an os', traditional 'os', 'caching', memory,hard drive, network load balancing ) Programming languate data structure level detail : "Database Internals, A Deep Dive into How Distributed Data Systems Work" by Alex Petrov