Editing Network model (section)

{{Short description|Database model invented by Charles Bachman}}
{{About|the database model}}
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{{one source|date=January 2019}}
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[[File:Bachman order processing model.tiff|thumb|320px|Bachman diagram of a simple network database]]
In [[computing]], the '''network model''' is a [[database model]] conceived as a flexible way of representing objects and their relationships. Its distinguishing feature is that the [[database schema|schema]], viewed as a [[graph (discrete mathematics)|graph]] in which object types are nodes and relationship types are arcs, is not restricted to being a hierarchy or [[Lattice graph|lattice]].

The network model was adopted by the [[CODASYL]] [[Data Base Task Group]] in 1969 and underwent a major update in 1971. It is sometimes known as the '''CODASYL model''' for this reason. A number of network database systems became popular on [[mainframe]] and [[minicomputer]]s through the 1970s before being widely replaced by [[relational database]]s in the 1980s.