March 2007
Beginner
526 pages
13h 53m
English
book
Introduction to the New Mainframe: z/VSE Basics
by Wolfgang Bosch, Hans Joachim Ebert, Helmut Hellner, G. M. (Jerry) Johnston, Wilhelm Mild, Ingolf Salm, Joerg Schmidbauer, Martin Walbruehl, Mike Ebbers
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316 Introduction to the New Mainframe: z/VSE Basics
12.10 What is DL/I?
Data Language/I (DL/I) has been developed from Information Management
System (IMS), which is the hierarchical database management system on the
z/OS platform.
Created in 1969, IMS was implemented on the basis of a hierarchical database
model. This concept introduced the idea to separate application programs from
the physical structure and storage of the data. It reduces data redundancy by
maintaining only one copy of the data.
The term
DL/I is used for the hierarchical structure of the database, the access
method (language interface), and (on the z/VSE platform) for the product itself. It
is also to a large extent compatible to IMS, but does not offer the same range of ...
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