Ingres - A Forgottent Database The Untold Story

Ingres (technically, Advantage Ingres Enterprise) is, arguably, the forgotten database. There used to be five major databases: Oracle, DB2, Sybase, Informix and Ingres. Then along came Microsoft and, if you listened to most press comment (or the lack of it), you would think that there were only two of these left, plus SQL Server. [From IT-Director]

Oracle, Microsoft, and IBM would certainly like the illusion of a 3 horse race, as this is the only way they can induce Ingres, Informix, and Sybase users to jump ship, and this, even though database migrations are by far the most risk prone and problematic aspects of any IT infrastructure.