Stage 3: Scaling to 100M+ Users 🌍

Added: 2026-05-06

[00:00:00]global, 100 million users, even a dedicated orders database is melting.

[00:00:05]This is the end game, horizontal sharding.

[00:00:08]We don't split by function anymore, we split by data ranges. Users A to M live in India, N to Z live in the US. This is how Google and Amazon stay up 24/7.

[00:00:20]The secret sauce, a routing layer. It intercepts every request and says, "User 542 is in shard three."

[00:00:28]It's complex, it's hard to manage, but it's the only way to reach infinite scale.

[00:00:33]Pro tip, to survive a literal earthquake, you partition across data centers. Even if one city goes offline, your app stays up. The ultimate test, at what point do you switch from SQL to NoSQL in this journey? Let's debate.