1) I don't think I am. The problem of (structural) subtyping is well known and researched and applying it to a database would not break new ground either. 2) T

1) I don't think I am. The problem of (structural) subtyping is well known and researched and applying it to a database would not break new ground either. 2) The preallocation overhead is not what is the problem. The files are simply extremely large for the amount of data in them. There has been plenty of measurement and I have done some of my own. With unacknowledged writes it's quite fast, but no other database client I know of does that because it's stupid. With the highest durability and safety mode it's slower than at least Postgres and Mongo still doesn't have transactions or generic indexes.