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Insulation between conceptual and physical structures
It can be defined as:
1. The Database Administrator should be capable to vary the storage structures without affecting users' views.
2. The internal structure of the database should be unaffected by the varies to the physical aspects of the storage, like changing to a new storage device.
3. The DBA should be able to vary the conceptual structure of the database without affecting all users.
Can a domain, assigned to a data element be changed? Yes. We can do so by just overwriting the entry in the field domain.
Where does view definition stored? A view definition is permanently stored as part of the database.
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