Database Cloud Models
Oracle provides a complete stack and various options to implement DBaaS. These different options are referred to as database cloud models, as shown in Figure 6-2.
FIGURE 6-2.    Different Database Cloud Deployment Models
The following are the most popular Database Cloud Deployment Models:
image   Virtual server based  The database is deployed as a part of Oracle Virtual Assembly or an Oracle VM Template and several VMs share the same physical server or hypervisor. This offers the maximum level of isolation (at the OS level), ...

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