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==History==
With the data progress in technology in the areas of [[processors]], [[computer memory]], [[computer storage]] and [[computer networks]], the sizes, capabilities, and performance of databases and their respective DBMSs have grown in orders of magnitudes.
The development of database technology can be divided into three eras based on [[database model|data model]] or structure: [[navigational database|navigational]],<ref>{{citation | author = C. W. Bachmann | title = The Programmer as Navigator | date = November 1973 | journal = CACM | url = http://www.cs.uiuc.edu/class/fa05/cs511/Spring05/other_papers/p653-bachman.pdf}} (Turing Award Lecture 1973)</ref> [[SQL]]/[[relational database|relational]], and post-relational. The two main early navigational data models were the [[Hierarchical database model|hierarchical model]], epitomized by IBM's IMS system, and the [[Codasyl]] model ([[Network model]]), implemented in a number of products such as [[IDMS]].
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