I am a little confused because I question the definition of the term "online" in OLTP and OLAP. I had the habit of thinking that the internet here means that we want our response in a limited time and based on the data available at a given time.
But OLAP queries can take a few hours to compute – is not it offline?
And a quick search indicates an offline OLAP that looks pretty confusing (online offline analytics processing) …?
What exactly is online?