Answer 1)
Scale vertically (scale up) To scale vertically (or scale up) means to add resources to a single node in a system, typically involving the addition of CPUs or memory to a single computer.
Scale horizontally (scale out) To scale horizontally (or scale out) means to add more nodes to a system, such as adding a new computer to a distributed software application. An example might be scaling out from one web server system to three web server systems. (ex: web farm scenario)
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