I have to say I also really like the fact that recovery is possible to begin with! Are there any other extant db/data store tools which enjoy the same append on

I have to say I also really like the fact that recovery is possible to begin with! Are there any other extant db/data store tools which enjoy the same append only awesomeness (as i understand, append only writes are the only reason this recovery is possible, plus in principle allows pretty awesomely fast writes). <Now goes back to coding in a functional language, which tends to enjoy append only writing when theres no state>