Hands-On Azure for Developers

Chapter 18: Scaling Azure Applications

1. Scaling out scales your application horizontally (by adding additional instances), while scaling up scales your application vertically (so better hardware is provisioned).
2. In most cases, you scale out rather than scale up. This is because the performance of the hardware is limited and it is easier to add another machine to the set rather than provision a new CPU and memory.
3. Not really—while conceptually it could be possible, serverless services avoid scaling up.
4. Yes—if you scale out Azure App Service, the price for the service will be multiplied by the number of instances currently working.
5. In SF, scaling out is perfectly fine. The dangerous operations are scaling up as it requires you to take your ...