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Part of the reason is that it's been a commercial database until recently. I also think it hasn't helped that it's closely associated with Clojure (for natural

Part of the reason is that it's been a commercial database until recently. I also think it hasn't helped that it's closely associated with Clojure (for natural reasons), which might make Java developers turn away from it. It's a shame, though. Datomic is a marvel.

amelius 2y ago
Yeah, the cost is the biggest reason probably. There's probably a lot of in-house developed Datomic clones out there (I know one, that was developed even before Datomic was a thing).
kragen 2y ago
quite aside from whether or not it's 'commercial', it's proprietary