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I think you can follow the steps in this link to install and to configure : https://onlinehelp.tableau.com/current/server-linux/en-us/server_linux.htm
I read a article before that multi node is better for what you need beacuse calculated fields are using a lot of power. I am not sure what you are trying to say with "cache extracted hyper database in memory" but i believe exract data sources run in the memory after loading from hard disk to memory.
I hope this reply helps you.