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Unified Modelling Language (UML)

Modeling language for designing object-oriented systems. Contrary to popular belief, UML itself is not a method, but a format that can be used with different methods. One method that uses UML is RUP (Rational Unified Process). Unified Modeling Language (UML)

Universal description, discovery and integration (UDDI).

A platform independent registry that allows organizations to describe their services and view services from other organizations.

Unplanned downtime

Unplanned downtime of the architecture under a BI solution. This can be caused by hardware and / or software errors, but also human errors.

Unstructured data

Information (or data) that cannot be stored in a relational, hierarchical, or network database. Think of e-mails, documents, reports, multimedia files and the like.

Unstructured information

Any document, file, photo, report, form, etc. that does not have a standardized structure that allows it to be stored in a row oriented storage system. It cannot be translated to rows / records or columns.


Changing data by overwriting it. This operation on data is usually not allowed in a data warehouse.

User-defined type (UDT)

A new data type can be composed based on the existing primary data types (number, text, bit, etc.).