Britton-Lee (IDM), Tandem (Non-Stop System), and Teradata (DBC) all offered early commercial specialized database machines.1 A more recent example was Oracle Exadata.
According to Julie McCann,2
"Finally, back in 1983 Boral predicted the demise of the Database Machine (DBM) and he was right to an extent [5].3 DBM architectures based on specialised hardware or tightly coupled to specific specialised machines were always going to be problematic. However as componentisation dissolves the DBMSs architecture into components and that this is integrated, without boundaries, with the operating system (which in turn only activated the components that are required by the DB function, thus tailoring the architecture down to the metal), means that at that instant the system becomes effectively a Database Machine but potentially without the problems of standardisation and portability of the past."
Ricardo, Catherine M. (2002). "Database Machines". Encyclopedia of Information Systems. Academic Press. pp. 403–410. doi:10.1016/B0-12-227240-4/00027-7. ISBN 978-0-12-227240-0. 978-0-12-227240-0 ↩
Mccann, Julie A. (2003). "The Database Machine: Old Story, New Slant?" (PDF). First Biennial Conference on Innovative Data Systems Research, CIDR 2003, Asilomar, CA, USA, January 5-8, 2003, Online Proceedings. Conference on Innovative Data Systems Research (CIDR) (1 ed.). Asilomar, CA, USA. /wiki/Julie_McCann ↩
Boral, Haran; DeWitt, David J. (1983). Database Machines: An Idea Whose Time Has Passed? A Critique of the Future of Database Machines (Report). https://minds.wisconsin.edu/handle/1793/58446?show=full ↩