The framing numbers

  • Netflix writes 3 million records per second to its database (0:00)
  • Instagram stored over a billion users on PostgreSQL for years (0:00)
  • Twitter serves 300,000 timeline requests per second from Redis (0:00)

The central thesis

  • No database is objectively "better" — each company has fundamentally different access patterns (0:00)
  • The database that is perfect for one would be a disaster for another (0:25)

What the video promises to deliver

  • Not just what each company uses, but why they chose it (0:25)
  • Which trade-offs they accepted, and what would break under a different choice (0:25)
  • A reusable mental framework for startups and system design interviews (0:25)