which of the following plays an important role in representing information about the real world in a dadabase? Explain briefly
1: data difination language
2: data minipulation language
3: buffer manager
Answers
Explanation:
The data definition language is important in representing information because it is used to describe external and logical schemas.
The data definition language is important in representing information because it is used to describe external and logical schemas.
The data manipulation language is used to access and update data; it is not important for representing the data. (Of course, the data manipulation language must be aware of how data is represented, and reflects this in the constructs that it supports.)
The buffer manager is not very important for representation because it brings arbitrary disk pages into main memory, independent of any data representation.
The data model is fundamental to representing information. The data model determines what data representation mechanisms are supported by the DBMS.
The data definition language is just the specific set of language constructs available to describe an actual application’s data in terms of the data model.
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