no-herd grobian@gentoo.org Fabian Groffen MonetDB is a main-memory database developed at CWI the Netherlands. The main-memory focus of the database has resulted in a column based way of dealing with relational tables. Due to this unconventional approach, MonetDB can be a very fast database for complex queries, and as such in use (and perfectly suitable) for intensive data-mining tasks. MonetDB 4 supports its own kernel language, MIL, the conventional SQL query language and the relatively new XML querying language, XQuery.