The world of unstructured data is a world where there is a basic division between
repetitive and nonrepetitive data.
Repetitive unstructured data are data where the data are organized in many records
where the structure and content of the records are very similar or even the same.
Fig. 8.1.15 shows repetitive unstructured data.
Fig. 8.1.15 Repetitive unstructured data.The other kind of data found in the unstructured environment is that of nonrepetitive
data. With nonrepetitive data, there is no correlation between one record of data and any
other. If there is a similarity of data between any two records of data in the nonrepetitive
environment, it is purely a random event.
Fig. 8.1.16 depicts the nonrepetitive unstructured environment.
Fig. 8.1.16 Nonrepetitive unstructured data.Yet, another aspect of data is the file organization of the data. Starting with a very simple
file organization, the world has progressed to a very elaborate and sophisticated
organization of data.
Fig. 8.1.17 shows the evolution of file structures of data.
Chapter 8.1: A Brief History of Data Architecture