Network DB
The network database is formed by generalization hierarchical due to assumption of the objects having more than one ancestor, i.e. each element of higher level can be connected along with any elements of the following level. In general, in touch between objects in network models no restrictions are imposed.
It is necessary to emphasize that the term "network" is used here in sense, absolutely unusual for an era of the Internet. This word emphasizes model of communications of data in base when each record can be in the relations "much to - much" with other records that makes graphic model of base similar to fishing network or a web.
Develop serious applications within a network model of the database quite difficult, and the complexity of development at complication of tasks increases in geometrical progression.
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