Distributed Database
Example Nets


This is a small toy example which describes the communication between a set of data base managers in a distributed system. The managers are supposed to keep their data bases identical. Hence, each update must be followed by a broadcast to all the other managers, asking them to perform a similar update.

The CPN ML declarations are described in great detail. Moreover, the example is used to illustrate three of the very basic concepts of net theory: concurrency, conflict and causal dependency.

Distributed Database

The example is taken from Sect. 1.3 of Vol. 1 of the CPN book. For more information on the CPN books please look at: http://www.daimi.au.dk/~kjensen/papers_books/rec_papers_books.html

The files for this net can be found in a subdir of cpntools called Samples\DistributedDataBase

The files are