Caching strategies

Summary

Being able to discuss where and how you'd add caching to a system, and the trade-offs of different invalidation strategies — a very common follow-up in system design interviews.

• 1Prepare a real example from your own projects where caching mattered.
• 2Be ready to explain cache-aside, write-through and TTL-based invalidation from memory.
• 3Practice reasoning about what NOT to cache — highly personalized or frequently changing data.