Add one small feature and suddenly your DB CPU hits 100%. The culprit is usually the N+1 problem caused by ORM's Lazy Loading. Here's how to diagnose it, cut 1000 queries down to 1, and avoid the ORM mistakes that cause it.
Establishing TCP connection is expensive. Reuse it for multiple requests.
Foundation of DB Design. Splitting tables to prevent Anomalies. 1NF, 2NF, 3NF explained simply.
Once you ship a public API, you can't change it freely. Compare four versioning strategies for evolving APIs without breaking clients, plus analysis of real-world choices by GitHub, Stripe, and Twilio.
Pringles can (Stack) vs Restaurant line (Queue). The most basic data structures, but without them, you can't understand recursion or message queues.
ORMs are like self-driving cars. Incredibly convenient, but sometimes you need to take the wheel — especially under high traffic.
The difference between developers who use ORMs well and those who don't comes down to this:
user.getComment() returns the correct data."It works" is half the battle. "It scales" is the real goal. Turn on SQL logging right now and hit an API endpoint. If queries are flooding the terminal, there's a performance problem waiting to be fixed — and fixing it can make a meaningful dent in DB costs.