Database Metrics: ○ Track buffer cache hit ratio, transaction log size, locks and deadlocks,?

Short answer: And cache usage to monitor the internal database performance.

Real-world example (ShopNest)

Checkout wraps stock decrement + order insert in a transaction so you never sell stock you do not have.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.