Without help, the database has no way to know where a row is without looking at all of them. An index is that help — a separate structure that tells the database where to look instead of scanning every row.
Why useEffect + fetch is quietly a cache you’re rebuilding by hand, and how TanStack Query’s shared, time-aware cache fixes it — keys, staleTime vs gcTime, and the parts people get wrong.
What is Redis? Why is it so fast? How does it work under the hood? Learn why Redis is the go-to choice for caching, real-time leaderboards, session management, and more.
