Scaling out enables you to run more instances of a web app. The pricing tier determines resources available to each instance used by the App Service plan that hosts the web service. Each pricing tier specifies the computing power provided, together with the memory and maximum number of instances that can be created.
If you initially deploy a web app using a relatively cheap pricing tier, you might find the resources are sufficient to start with. But the resources might become too limited if demand for your web service grows, or if you add features that require more power. In this case, you can scale up to a more powerful pricing tier.
In the hotel reservation system, you notice a steady increase in the number of visitors, beyond the variations caused by special offers or events. Your company is adding more features to the web app that require more resources. You’re nearing the scale-out limits of your current App Service plan pricing tier, so you need to scale up to a tier that provides more instances and more powerful hardware.
In this unit, you learn how to scale up the web app to meet the increasing resource requirements.
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