Most people who use an index wrong dont understand space and time tradeoffs at all, how to measure if there is a problem, or how to identify what a thing should

Most people who use an index wrong dont understand space and time tradeoffs at all, how to measure if there is a problem, or how to identify what a thing should be in the first place. Most people who at least think a bit get pretty far before the vendor specific gotchas start biting.