Oracle Cloud Infrastructure 2023 Foundations Associate · Free Practice Question Easy
Question 4
What does compute instance horizontal scaling mean?
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A
Changing compute instance size
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B
Adding additional compute instances
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C
Stopping / starting the instance
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D
Backing up the data to object storage
Reveal correct answer
Correct answer: B
Explanation
Horizontal scaling means that you scale by adding more machines into your pool of resources whereas Vertical scaling means that you scale by adding more power (CPU, RAM) to an existing machine.
An easy way to remember this is to think of a machine on a server rack, we add more machines across the horizontal direction and add more resources to a machine in the vertical direction.
With horizontal-scaling it is often easier to scale dynamically by adding more machines into the existing pool — Vertical-scaling is often limited to the capacity of a single machine, scaling beyond that capacity often involves downtime and comes with an upper limit.
Reference: https://medium.com/@abhinavkorpal/scaling-horizontally-and-vertically-for-databases-a2aef778610c
Discussion
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