What it is
Vertical scaling, also known as “scaling up and down”, is a technique where a system’s capacity is increased by adding CPU and memory to individual nodes as the workload increases. Let’s say, you have a computer of 4GB RAM and want to increase its capacity to 16GB RAM, scaling it vertically means switching to a 16GB RAM system. (Please refer to horizontal scaling for a different scaling approach.)
Problem it addresses
As demand for an application grows beyond the current capacity of that application instance, we need to find a way to scale (add capacity to) the system. We can either add more compute resources to existing nodes (vertical scaling) or more nodes to the system (horizontal scaling). Scalability contributes to competitiveness, efficiency, reputation, and quality.
How it helps
Vertical scaling allows you to resize your server without changing the application code. That contrasts to horizontal scaling, where the app must be replicable to scale, potentially requiring code updates. Vertical scaling increases the capacity of an existing application by adding compute resources, allowing the app to process more requests and do more work concurrently.
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