PART 9 Flashcards
(20 cards)
a collection of facts such as number, words, measurement, observation, symbol or even just a description of things.
Data
Is a raw fact that process into information
Data
Data should be of high quality, meaning that they should be :
accurate, complete, timely, consistent, accessible, relevant, and concise.
Why Managing Data is Important?
a. Less waste of money
b. Gaining competitive advantage
c. Better functioning organization
- Data come from multiple sources
-Internal sources
-External sources
-Personal sources
Data Management: The Hierarchy of Data
- Bit
- Byte
- Field
- Record:
- File
represent the smallest unit of data a computer can process “binary” means that bit can consist only of a 0 or a 1.
Bit
group of 8 bits represent a single character. A ____ can be a letter, a number, or a symbol.
Byte
a logical grouping of character into a word, a small group of words, or an identification number. Example, a student’s name in university’s computer files would appear in the “name”. can also contain an image or any other type of multimedia.
Field
logical grouping of related fields.
Record
group of related records.
File
ADVANTAGES OF THE DATABASE APPROACH
No data redundancy
Single update
Task data independence
Improved data integrity
i. Data is stored only once, eliminating data redundancy and reducing storage cost.
No data redundancy
i. Because data is in only one place, it requires only a , reducing the time and cost of keeping the database current
Single update
i. As users’ information needs expand, the new needs can be more easily satisfied than under the flat file approach.
Task data independence
i. Sine data is stored only once for each entity we don’t need to worry about updating multiple records for the same entity.
- Improved data integrity
DISADVANTAGES OF DATABASE APPROACH
- More expensive
- More difficult to recover from a failure
- Because it is so different from the file-oriented approach, the database approach requires training users
May be inertia or resistance
-Additional hardware, software, storage and network resources are required, needs specialized professional.
- More expensive
A failure of the system effects all application since all share the data
- More difficult to recover from a failure
Because it is so different from the file-oriented approach, the database approach requires training users may be…..
May be inertia or resistance
