IBM introduced a relational database on system/38 a long time ago. They developed the database improving its functionalities and introducing SQL. They then decided to take all their databases under a common umbrella called UDB. It enables a large number of features to be implemented on their popular machines without a need to depart from whatever is already installed.
Click here for IBM's definition of UDB.
To check some of the features of UDB on iSeries, click here.
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This was first published in March 2002