Chapter 8 Conceptual Data Modelling Flashcards
1
Q
What is data dictionary?
A
- Known as data repository
- Data about data (metadata)
- information about the system’s data
2
Q
Data dictionary is used to:
A
- Provide documentation
- Eliminate redundancy
2
Q
External entity structure
A
Name
Description
Input data flows
Output data flows
2
Q
Process
A
Name
Description
Input data flows
Output data flows
process description
3
Q
Data Flow
A
Name
Description
Origin/Source
Destination
Data structure
4
Q
Data Store
A
Name
Description
Input data flows
Output data flows
Data structure
5
Q
Data structure
A
- described using algebraic notation
such as - = + {} [] ()
6
Q
Data element
A
Data element name
Description
Elem characteristics:
- Type
- Length
- Output format
