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It seems that denormalization is done on a case-by-case basis. If you do decide to denormalize your tables for efficiency, make sure you are thoroughly testing your queries. As @Pieter Geerkens mention Every redundancy made for for the purpose of one specific query will slow down all other queries, inserts, and updates against the same data. That is ...


"Put the webserver (Node.js in this case) on the same EC2 instance as the database" Never put your app server and DB server into one machine. Since you are using EC2 there are some white papers on Amazon named "Architecting on AWS" and there is a section called scalability. All your app servers should be state-less. It means it should be no data stored on ...

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