Architectural scenarios
High availability solutions always involve redundancy, and the basic rule of high availability is to identify and remove single points of failure (SPOFs) in the architecture. A user environment can have multiple layers, such as, cloud, application, firewall, security, facilities, storage, and database layers. All of these layers can be in one or multiple data centers, and they can be in one or multiple servers that are running under multiple operating systems.
In Figure 4-1 on page 70, we see various components of a database ...

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