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I think you would be surprised about the scaleability of Relational Databases. Most of the large scale applications you use rely on Relational Databases, even a

I think you would be surprised about the scaleability of Relational Databases. Most of the large scale applications you use rely on Relational Databases, even at the largest scale. Modern distributed SQL system such as TiDB or the open source database Vitess are capable of serving any amount of traffic and they are really easy to use and very well understood. In fact Quora uses a relational database

joatmon-snoo 7y ago
...Vitess is sharded on top of MySQL. It literally only exists because MySQL doesn't scale. I will agree, though, that for the vast majority of use cases, worrying about using a so-called "scalable" DB is a YAGNI-type concern, and the normal options should be more than sufficient.