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Scalability (scalability) is a characteristic of a system or software that indicates its ability to effectively increase or decrease its performance and resources in response to changing tasks or work volumes. The basic idea is that the system can adapt to the increase in load or data volume without losing productivity or quality of service. Scalability can be vertical or horizontal.
Vertical Scalability
Includes an increase in capacity or resources at the existing equipment level. For example, adding new processors or memory to an existing server.
Horizontal Scalability
Includes adding new elements or nodes to the system. For example, distributed systems that can easily scale by adding new servers to a cluster.
Scalability is important for various areas of information technology, including web services, databases, applications, cloud solutions, and more. The ability to scale allows you to use resources efficiently, while ensuring optimal performance and system response to changes in the environment. Not to be confused with High Availability (High Availability).
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