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What is Scalability Testing?

Scalability testing is a type of performance testing aimed at determining a system's ability to handle an increasing amount of workload or to be easily expanded to accommodate growth. This form of testing evaluates the system's response when subjected to a range of user loads, from low to high, and identifies any points of failure or bottlenecks that may arise as the load increases.

The primary objective of scalability testing is to ensure that an application can scale up (add resources to handle increased load) and scale out (add more instances) without significant performance degradation. It can involve simulating a high number of concurrent users, transactions, or data volumes to assess the system’s capacity limits.

Key metrics evaluated during scalability testing include response time, throughput, resource utilization (CPU, memory, etc.), and maximum load capacity. This testing is crucial for applications expected to grow in usage or functionality, such as web services, APIs, and enterprise applications, as it helps developers and stakeholders understand the application's potential and plan appropriately.

In conclusion, scalability testing plays a vital role in the software development lifecycle, ensuring that systems not only perform well under expected conditions but also can accommodate future growth efficiently.

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