Oracle has moved rapidly in recent months to increase activity in the cloud.
The company announced its intent February 9 to buy Taleo, a developer of cloud-based human resource management applications, for $1.9 billion.
The company also plans to offer through Oracle Public Cloud the RightNow customer service applications it bought for $1.5 billion in January.
In a keynote speech at the Oracle OpenWorld conference in San Francisco, he said the company’s Oracle Fusion Applications were available through the cloud.
He said Oracle’s Public Cloud service is based on industry standards, such as XML, Java and BPEL, making it possible to move applications on and off the service and to other services.
"You can take any existing Oracle database and move it to the cloud," Ellison said in the keynote. "Oh, and by the way, you can move it back if you want to. Or you can move it to the Amazon cloud, if you want. Everything is portable. Your data is portable."
He used the event to jab at Salesforce.com’s President and CEO Marc Benioff, saying that company’s cloud strategy was “the ultimate vendor lock-in.”
SAP, to help it expand its lineup of cloud-based applications and bring more "cloud DNA" to the giant software company, completed its $3.4 billion purchase of SuccessFactors, a developer of on-demand human capital management applications.