Paper Details

%T Parallel\-DB4GL: An implementation of a self\-describing object\-oriented database application generator on transputer hardware
%A J. P. Gray, F. Poole
%E Stephen J. Turner
%B OUG\-12: Tools and Techniques for Transputer Applications
%X In general, this research project is concerned with the use
   of transputer based parallel hardware to improve the
   performance of database software. Specifically, the aim of
   the project is the enhancement of a database application
   generation system, Data Base 4th Generation Language
   (DB4GL), by converting the DB4GL generated database
   applications to run on transputer networks.A prototype
   Parallel\-DB4GL (P\-DB4GL) system has been designed and
   implemented. In P\-DB4GL, the application code modules
   generated by DB4GL have been redesigned as concurrent Occam
   [InmosSSb] processes. A number of DB4GL data access code
   modules (entity handlers and schema handlers) have been
   implemented, and used to construct simple database
   applications. Additionally, simulations of DB4GL modules not
   yet implemented (for example, User Processes and Filer
   Processes) have been written, and used in the testing of
   these simple database applications.The P\-DB4GL applications
   have been test run on a number of different transputer
   configurations. Results have been obtained which show
   significant performance improvements when applications are
   run on small (one to four processors) transputer networks.
   The principal benefit comes from the ability to perform
   multiple concurrent disc input/ouput, thus increasing disc
   throughput, and hence improving overall application
   performance. Development and testing of the prototype
   P\-DB4GL has confirmed the feasibility of using transputer
   based parallel hardware for DB4GL applications. It has
   indicated how and where significant performance gains can be
   obtained in the full working version of P\-DB4GL, currently
   under development.

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