LOad Testing : We have to verify at what point system get crash or unusable.And have to check whether the system is capable of handling an anticipated load
Example: Consider an online shopping web application, with a maximum of 500 concurrent users at peak hours.increase number of users perform the transaction via ATM. And estimate when THe Atm get crash
Stress testing : we have to verify that how system reacts when maximum limit of the users use the system.Stress Testing is conducted to check the systems capability beyond the anticipated load.
Example: Considering the example above the stress testing will be conducted on the application by increasing the users beyond 500 in small steps (say 100) till the application starts to degrade or breaks dow
Performance Testing : How fast system reacts when perticular user transaction in website. and estimatee performance requirement specifications with acceptable response times and resource utilization (memory, processor, network).
Example
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