Comment by pianopatrick

Well I think if you were doing the 1976 way you might not even have multi processing or multi threading. Just a single process with a single thread. And so you don't have a database connection pool, you just have a single database connection and do one query at a time maybe.

That may not work for network connected software with lots of requests per second. But such software did not exist too much in 1976 either as there was not very much networking going on.