Introduction Flashcards
Basic definitions
1
Q
What is a database?
A
A collection of related data
2
Q
What is a database management system (DBMS)?
A
A software package to facilitate the creation and maintenance of a database
3
Q
What is a database system (DBS)?
A
A DB + DBMS
4
Q
What is a mini-world?
A
A part of the real world about which we want to store information in a database.
5
Q
What is information?
A
Known facts about the mini-world that can be recorded and have an implicit meaning.
6
Q
What is the arity of the 3-layer schema architecture?
A
Exactly one conceptual schema. Exactly one internal schema. At least one external schema.
