A Database System Separates the Logical and Physical View of Data.Such

question 47

Multiple Choice

A database system separates the logical and physical view of data.Such separation facilitates the development of new applications since programmers can concentrate their efforts on coding application logic.The term physical view refers to

• A)how a user or programmer conceptually organizes and understands the data.
• B)how the DBMS accesses data for an certain application program.
• C)how and where the data are physically arranged and stored.
• D)how master files maintain facts used by certain application programs.

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Definitions:

Photosystem

A complex of proteins and pigments in plants and algae that absorbs light energy and converts it into chemical energy during photosynthesis.

Chlorophyll

A green pigment found in the chloroplasts of plants, algae, and some bacteria, essential for photosynthesis as it absorbs light energy to convert carbon dioxide and water into glucose.

Mitochondrion

An organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur. It has a double membrane, the inner layer being folded inward to form layers (cristae).

Chloroplast

Organelle of photosynthesis in plants and photosynthetic protists. Light-dependent reactions occur at its inner thylakoid membrane; light-independent reactions, in the stroma.