NB: Datomic is not "append only" (when it was first released, I thought it was too): Note that accumulate-only is a semantic property, and is not the same

NB: Datomic is not "append only" (when it was first released, I thought it was too): Note that accumulate-only is a semantic property, and is not the same as append-only, which is a structural property describing how data is written. Datomic is not an append-only system, and does not have the performance characteristics associated with append-only systems. Source: http://docs.datomic.com/indexes.html http://docs.datomic.com/indexes.html