MINERVA superseeded IF/Prolog.
Please see
http://www.ifcomputer.co.jp/MINERVA
for details.
We discontinued to sell IF/Prolog Dec 31. 2003.
For current customers, we continue to provide
professional support for IF/Prolog until Dec 31, 2008.
Companies often need to share an internal database in distant
offices, but high running cost is usually the main obstacle for its
implementation.
IF Computer Japan has developed IFNET, a managing system for
distributed databases on the telephone. This system always keeps
the contents of several databases identical. It restrains at the same
time the running cost because it only exchanges revised data, and not
the entire database.
IFNET administrates the database in three phases: revise phase,
transmission phase and conjunction phase. In the first phase, the
local database is revised. In the second transmission phase, the data
which are identified as reivised ones in the first phase in the local
terminals are exchanged and in the third conjunction phase the exchanged
data is fed. The change is performed in the file base. Considering
the case that files with the same name are revised in both databases
between a connection and the next time, the priority of either data-
base should be preset or the conflict should be solved manually each
time.
IFNET is operated between IF Computer Japan and IF Computer Asia in
Hong Kong everyday. Data are exchanged once a day in the midnight.
In the future IF Computers all over the world are planned to connect
through IFNET and exchange information.
Hardware: UNIX Workstation
Software: IF/Prolog, UNIX
| 
