Scalability refers to the ability to add and remove capacity in small units.Horizontal scalability refers to the ability to add capacity on the server side.Vertical scalability refers to the ability to add capacity on the client side through additional workstations and movement of work between clients and servers.

Question

Quizplus · Accepted Answer

Scalability indeed refers to the ability to add and remove capacity in small units. However, horizontal scalability means adding more machines or instances to a pool of resources to handle increased load, while vertical scalability means adding more power (CPU, RAM) to an existing machine. The explanation about vertical scalability referring to the client side is incorrect; it pertains to increasing the capacity of a single server.

Scalability Refers to the Ability to Add and Remove Capacity