It's 2 a.m. and your phone is buzzing. The order dashboard, which loaded in 80 milliseconds last spring, now takes eleven seconds. Nothing in the code changed. What changed is the table: it went from...
It's a Tuesday afternoon, and the dashboard that loaded instantly during your first month of launch now takes eleven seconds. Nothing in the code changed. The table just grew from 5,000 rows to 4 mill...
You wrote the query in an afternoon. It ran against your development database in four milliseconds, the test suite went green, and you shipped it. Six weeks later, someone in support forwards a screen...
Your app was fast for a year. Nothing changed — same code, same server, same query you wrote in an afternoon and never thought about again. Then one Tuesday the orders page takes eleven seconds to loa...
You wrote a function that worked perfectly on your laptop. It flew through a list of 50 names, sorted them, found the duplicates, and returned an answer in a blink. Then you shipped it, real users sho...
