That's not been my experience at all. Quite the opposite. I actually can't remember a single time in 15 years where I've ever seen that. Maybe it's happened, b

That's not been my experience at all. Quite the opposite. I actually can't remember a single time in 15 years where I've ever seen that. Maybe it's happened, but I don't remember, but I can easily recount tons of poorly performing SQL queries though. Sub-selects, too many joins, missing indexes, dead-locks, missing foreign keys... I'm not saying it wouldn't cause a problem, I'm saying I've never, ever seen production code where someone dumped tons of data out and then processed it. I have seen people try and make extremely complex ORM calls that were fixed by hand-coded SQL, but that's a different problem.