Love how a teacher of mine described IO wait for CPUs on a blackboard.
"That's calculation time." *draws three small lines on the blackboard* And this is IO wait. *draws a really long line, goes out of the class, out of the school, comes back* "Yes, this is IO wait. No matter how good and fast your CPU in your gaming PC is, if your hard drive is shit, everything is shit."

Whole class was done for the rest of the day then

This is perfect teaching.

I'm having a joy of a time with a DBA turned developer who insists that pulling employees one at a time, think getEmployee(int EmployeeNum), is faster than loading the needed employee fields into a DataTable and then searching it. He says he doesn't believe a in memory DataTable search (via LINQ) can be faster than an indexed table in a DB, but he doesn't add in the time to call the DB that lives in a data center.

@bkwilliams sounds like a terrible DBA too.

@Rabb reason why he is now a dev.