On-Demand Infrastructure

An On-Demand (AWS) infrastructure provider is one where hosts onto which the Oracle Middleware will be installed are created on-demand as part of the process of provisioning the Oracle Middleware platform. This approach relies upon an Amazon Machine Image (AMI), which is a Virtual Machine template, for creation of target hosts that underpin the Oracle Middleware platforms.

For EC2 instances, you are not required to pre-register hosts in the Infrastructure Providers since these are delivered through Infrastructure-as-a-Service. However, if you want to pre-register the hosts, say if different teams are responsible for provisioning the target VM and for provisioning the Middleware, then you can easily do so with the Pre-Existing Infrastructure feature.