How will you split your data across multiple database instances when a single disk fills up?

Hacking the System Design Interview (Stanley Chiang): A Detailed Review and Better Alternatives

Memorizing these "rule of thumb" numbers helps you make quick decisions: Memory access is fast (100ns); Disk seek is slow (10ms). Availability: "Three nines" (99.9%) means ~9 hours of downtime per year. 1 million users with 1KB data each = 1GB of storage. 🏗️ Common Architecture Patterns

The gold standard for understanding how data systems actually work under the hood.

: The book advocates for a disciplined design approach—often referred to as a "roadmap to success"—that helps candidates find solutions to "baffling" problems under pressure.

This systematic approach is your most valuable takeaway from the book. It's a reusable mental model to tackle any system design question:

: The book includes deep dives into questions based on hundreds of actual interviews conducted at companies like Google, Meta, and Amazon.

– Define the features, users, and what not to build.

Hashing algorithms, database selection.