If you look at what Reddit [1] and Facebook [2] did in their data layers to scale past what the relational model can offer, they start to look pretty darn close

If you look at what Reddit [1] and Facebook [2] did in their data layers to scale past what the relational model can offer, they start to look pretty darn close to the Datomic architecture. Linearized. Time aware. Immutable. Reads from cache. Horizontal scaling. Query/writer/storage separation. And obviously they are cloud architectures, built and operated by teams of distributed systems engineers capable of tuning performance of such a system. [1] https://news.ycombinator.com/item?id=15726376 https://news.ycombinator.com/item?id=15726376 [2] http://www.dustingetz.com/:datomic-facebook-tao/ http://www.dustingetz.com/:datomic-facebook-tao/ Neither of these architectures resemble the relational model anymore. They resemble a half-baked bug-ridden implementation of half of Datomic. TLDR: Nobody likes their database and zero teams at scale run vanilla out-of-box database. This might shed light on what people mean when they are talking about tuning Datomic: http://www.dustingetz.com/:datomic-performance-gaare/ http://www.dustingetz.com/:datomic-performance-gaare/ I'm sure there is more but this is the only thing I have ever come across.