Datomic is interesting. It is somewhat similar to object databases like ZODB. I use an object database called Durus (spiritual derivative of ZODB). Both ZOD

Datomic is interesting. It is somewhat similar to object databases like ZODB. I use an object database called Durus (spiritual derivative of ZODB). Both ZODB and Datomic make use of aggressive caching in the application. That is a huge performance boost for applications that do a lot of reading and little writing. ZODB essentially puts the indexes in the application, rather than having the DB layer take care of indexes. Again, I understand this is similar to how Datomic works. Developing an application on top of ZODB vs on top of an SQL database leads to a very different data model design. You can't just swap one database layer out for the other and expect things to work well. I'm not surprised if a team who is used to developing on top of SQL-like DBs did not have good luck when moving to Datomic. It is just a very different model.