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I was building a new system which I have not done in some time. I just wanted to get fresh new updated Debian Linux system so I did a fresh install and during the disk partitioning, I asked myself if I should create a swap partition under Debian, create an actual swap file (which I've never done), or just omit a swap partition/file all together since my machine has 16 GB's of RAM and will likely never use it.
Can someone tell me what is common practice in the Debian world or which would make the most sense? This machine will be a dedicated database server only with no other software / services running on it with the exception of NTP, SSH, and other required system services.
If you need a swap solely depends on your amount of RAM and the actual workload this machine has. Without knowing that nobody here will be able to give you serious advice.
On my workstation with 16GB of RAM I have 1GB of swap that rarely ever gets used, but I don't run databases, so this doesn't apply to your case anyways.
So my answer: Since we don't know your workload I would recommend to go for swap, with disk sizes today a few GB of swap won't matter and having swap that won't be used will not affect performance (and can simply be deleted if necessary, especially if you use a swap-file).
The real answer: Monitor your workload and decide based on that data.
Distribution: Debian Sid AMD64, Raspbian Wheezy, various VMs
Again, I only have a PC but I've 16GB of RAM and no swap file. Far as I know the only thing you need a swap file for other than if you run out of RAM is to hibernate. I certainly don't have any problems - I specced this machine with more RAM than I ever tend to use so that I didn't need to bother with swap.
Without knowing the usage part nobody can say if you still need it. swap is not a remnant from the past that is not used anymore on modern machines, it depends solely on your use-case if you need it.
So unless you are sure about the usage I would recommend not to omit it.
Regarding which is better, file or partition, it doesn't matter at all.