Self Describing Nature (Meta Data) in a Database System
A fundamental characterstics of the database approach is that the database system contains not only the database itself but also a complete defenition or description of the database structure and constraints. This definition is stored in the DBMS catalog, which contains information such as the structure of each file, the type and storage format of each data item, and various constraints on the data. The information stored in catalog is called meta data. Therefore, meta data is also called as data about data.
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