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UML and Data Modeling: A Reconciliation by David Hay

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During the mid 1960s, while he was working for General Electric, Charles Bachman developed the Integrated Data Store (IDS), one of the first database management systems. Subsequently, IBM adopted it as their product, Integrated Data Management Store (IDMs). This used a network structure, which made use of programmed, hard-coded, links between elements. This meant that database structures were invariably very complex and difficult to manage, which further meant, among other things, that they were difficult to change.

It also meant that traversing the network was economical enough, but if you wanted to search based on the values of leaf nodes, it could get very expensive.[63]

In October 1969 the Database Task Group of the Conference ...

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