data-architecture-a

Field name

Field length

Field type

Field identifying characteristics

Native metadata are used to identify and describe data that are stored in big data.

Derived metadata take many forms. Some of the forms of derived metadata include the
following:

Description of how data were selected

Description of when data were selected

Description of the source of data

Description of how data were calculated

Fig. 9.2.12 depicts the different types of metadata.

Fig. 9.2.12 Differences between native metadata and derived metadata.

With metadata stored in big data, there arises the issue—where should metadata be
stored? Traditionally, metadata have been stored in a repository. The repository is stored
physically separately from the data itself. But in the world of big data, there are some

Chapter 9.2: Analyzing Repetitive Data