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Difference between scaling horizontally and verticallyHorizontal scalingmeans that you scale by adding more machines into your pool of resources whereasVertical scaling means that you scale by adding more power (CPU, RAM) to an existing machine.

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Horizontal Clustering - Connection between server across two or more physical machines. It is done to achieve fail-over.

Vertical Clustering - servers within single physical machine/Unix box. It is done for load balancing.

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