Ellison, who struck up a close friendship with Jobs during his time as a director at Apple, said that the tech mastermind worked "incessantly" and was "a bit of a control freak".
He told attendees at the D10 conference: "Steve would translate good ideas into a finished product unlike anyone in the industry. That was Steve, until it was perfect. And then once it was perfect. And then he moved on to the next problem."
He added: "Working incessantly until it was done, that was Steve. He wanted to control every aspect. Including how you pay for an item in a store. Or what it looked like in a box."
"He went through some very distinct phases. In the first phase, people misunderstood him," CNET quotes him as saying.
"But he was learning from those mistakes. The way he negotiated didn't work very well. But he was so incredibly smart that he changed his behaviour."
Jobs's life and work is the subject of the upcoming biopic iOBS: Get Inspired written by Aaron Sorkin, and a separate film called Jobs: Get Inspired with Ashton Kutcher attached in the title role.