1. What is Capacity Planning? Capacity planning is the discipline of answering one question in a systematic way: “Given how the business expects customers to use the site, what amount of compute, database, cache, network, and storage do we need so the system remains fast and reliable, even during peaks and failures?” Conceptually, it is […]
Big Picture Overview Before a single server can handle all your traffic, you face a fundamental problem: as your application grows, requests pour in from thousands of users simultaneously. A single server—no matter how powerful—has limits. It can only accept a finite number of connections, process a finite number of requests per second, and store […]
Big Picture Overview Imagine you’re trying to visit amazon.com, but computers don’t understand English. They only speak IP addresses—long numbers like 205.251.242.103. Someone needs to translate the human-friendly name (amazon.com) into the machine-friendly address. That’s the Domain Name System (DNS). Without DNS, you’d need to memorize thousands of IP addresses. The internet would be unusable. […]
My Notes 