October 2013
Beginner to intermediate
244 pages
5h 53m
English
Content preview from Joe Celko’s Complete Guide to NoSQL
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Chapter 13
Hierarchical and Network Database Systems
Abstract
The first true databases were based on hierarchical and network database models. These products still dominate commercial data today on mainframe commercial platforms. Failure to understand them means that you will never be able to move out of legacy systems to other platforms. This database model was defined by Charles Bachman and it influenced many other directions.
Keywords
ANSI X3H2 Database Standards Committee; Charles Bachman; CDL; CODASYL; DL/I; hierarchical database systems; IDMS; IDS (Integrated Data Store); IMS; NDL (Network Database Language); network database systems
Introduction
IMS and IDMS are the most important prerelational technologies that are still in wide use today. ...
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