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Joe Celko’s Complete Guide to NoSQL by Joe Celko

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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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