As the question suggests, is it a good recommendation to enable a swap file on an Amazon EC2 instance e.g T3.nano or T3.micro
Or should you solely rely on physical RAM?
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Paging space is useful when you are uncertain about maximum memory use and do not want to allocate more memory to hosts. This is your decision specific to your workload, you must do your capacity planning.
Local disks, where available, make good paging space, as durability and shared storage is not required.