Database Indexing

Your database isn’t slow.

You just don’t understand indexing. 😬

I know that sounds harsh — but I learned it the hard way. A few years ago, we were scaling a system and a simple WHERE company_id = 18 query started dragging. The team blamed cloud costs ☁️, RAM 💾, even the ORM. Turns out the database was doing a FULL TABLE SCAN — literally checking every single row because the table was unordered.

One simple B-Tree index later, the execution plan flipped to INDEX RANGE SCAN — and suddenly the “infrastructure problem” vanished. 🚀

Here’s the uncomfortable truth: most developers throw hardware at a problem that a single index could solve. Indexing doesn’t rearrange your table — it builds a sorted data structure with pointers to the actual rows, so the database searches smartly instead of scanning blindly 🔎 .

That day changed how I look at performance forever.

So let me trigger a debate 👇

If indexing is this powerful…

why are so many production systems still running on full table scans? 🤔