Here's to the multi-tenant application, an invention of the Internet age and without which many of the low-cost services, such as search and travel reservations, would be impossible. And here's to the multi-tenant doubters, such as Oracle's Larry Ellison, who recently questioned its "weak security model" and its "co-mingling of competitors' data."
I'm going to claim an already strong innovation is going to get stronger. Maybe you don't really want to play such multi-user games such as Mafia Wars or Farmville or post to your co-workers' Facebook walls. Even so, you need multi-tenant applications. Without them, we'll need to throw a lot more money and computing resources at the services flowing out of the Internet that we've begun to take for granted.

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