LOGICAL AND PHYSICAL STRUCTURE Flashcards
is a data allocation process – Storage representations possible for logical structure.
PHYSICAL STRUCTURE
the process of allocating of data. – The set of operations that are legal for physical structures.
LOGICAL STRUCTURE
set of values, item of information
DATA
single unit of information
DATA ITEM
Types of Data Item
Group item
Elementary item
data item that can be divided into sub-items.
Group item
it can’t be divided into sub- items.
ELEMENTARY ITEM
Example of group item
Name date time
Example of elementary item
Student number age blood type
Classification of Data Types
Elementary data types or Simple data types
Structured data types
These are the basic data types
Elementary data types or single data types
The value of one of these components is atomic, that is, it consists of a single entity and could not be divided.
Elementary data types or single data types
a collection of complex number of information.
Structured data types
Types of Elementary data types:
Primitive data types
Standard primitive
enumerated data type
Primitive data types