Rational Software's
ClearCase version control system stores almost all of its information in
databases. These aren't
proper databases, like
Oracle or
Informix, but instead are home-grown databases, which Rational refer to as
Versioned Object Bases, or
VOBs for short.
As well as storing the text of all the elements (files and directories), ClearCase VOBs also store 6 different types of metadata (attributes, branches, element types, hyperlinks, labels and triggers).
About the only kind of data which isn't stored in a VOB are: