Oracle Exam 1Z0-1085-21 Topic 5 Question 21 Discussion

Changing the Shape of an Instance (Horizontal Scaling)

You can change the shape of a virtual machine (VM) instance without having to rebuild your instances or redeploy your applications. This lets youscale upyour Compute resources for increased performance, orscale downto reduce cost.

Autoscaling (vertical scaling)

Autoscaling lets you automatically adjust the number of Compute instances in an instance pool based on performance metrics such as CPU utilization. This helps you provide consistent performance for your end users during periods of high demand, and helps you reduce your costs during periods of low demand.

As load increases, instances are automatically provisioned: the instance poolscales out. As load decreases, instances are automatically removed: the instance poolscales in.

https://docs.cloud.oracle.com/en-us/iaas/Content/Compute/Tasks/resizinginstances.htm