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the                                                 site non-relational      database systems

Hierarchical DBMSes

 

IMS - IBM’s hierarchical mainframe DBMS


Model 204 - Rocket Software’s hierarchical DBMS



Database management systems have been around for a long time... a lot longer than the relational model and SQL. Of course, SQL systems (which are based on relational concepts), are the primary DBMSes implemented in large corporations today.


The links on this page highlight some of the more popular non-relational database products that are available.


Let’s take a look at some of the more popular non-relational DBMS product offerings:

One popular non-relational DBMS type is the hierarchical DBMS. Popularized in the 1960’s, IBM’s IMS is the most popular example of such a DBMS. IMS is still used in many of the world’s largest and most performance sensitive applications.


If interested, you can find a nice primer on IMS here.

Other Non-Relational DBMSes


Adabas - Software AG’s inverted list DBMS


Cache - Intersystem’s object DBMS

 

IDMS - CA’s network/CODASYL DBMS


U2 - Rocket Software’s multi-value DBMS


Versant Object Database - from Actian

There are many other types of database systems, too.


Some are more “relational”-like than others.


Some are completely different and if the only thing you know is SQL, don’t attempt to use these DBMSes without some help.

Dr. E.F. Codd

Inventor, Relational Model

What about NoSQL database systems? more>

Yet another trend in database systems is occurring right now – NoSQL databases.


Click here for more information on NoSQL.

NoSQL

IBM’s IMS Family web site

Learn Why Legacy Databases are Here to Stay