Big week last week in cloud news. Oracle’s occupation of San Francisco for OpenWorld 2011 produced a few good sound bites as CEO Larry Ellison unveiled the company’s Public Cloud offering (and took a swipe at Benioff and salesforce.com in the process). Ellison on Multi-Tenancy: ‘State-of-the-Art 15 Years Ago’ During last week’ Oracle OpenWorld conference, Ellison had a lot to say about the cloud and Oracle’s competition. In one fell swoop, Ellison unveiled Oracle’s Public Cloud, trashed multi-tenancy and labeled Salesforce as the “roach motel” of cloud providers. It was Ellison’s thrashing of multi-tenancy that we found the most troubling as he’s dead wrong. Ellison argues for co-mingling data at the virtualization layer instead of the database layer, which is ludicrous. The key is for vendors to implement multi-tenancy that provides the best economic results for customers while ensuring security. That’s exactly why salesforce.com and Okta are built with more.