I wonder how all those column-based database deal with salability. I've heard some miracle stories about their performance and they seem to be used for really,

I wonder how all those column-based database deal with salability. I've heard some miracle stories about their performance and they seem to be used for really, really large data sets. I've never heard anyone complain about lack of flexibility, but of course there are many different flavors of column-oriented storage. Some are relational and support SQL.