Chapter 3 Flashcards
What are concurrency control strategies?
Features of a database that allow several users access to the same data item at the same time.
What is a data type?
Determines the sort of data permitted in a field, for example numbers only.
What is data uniqueness?
Ensures that no duplicates are entered.
What is a database constraint?
A restriction that determines what is allowed to be entered or edited in a table.
What is metadata?
Defines and describes the data and relationships between tables in the database.
What are read and write privileges?
The ability to both read and modify a file.
What is read-only access?
The ability to read a file but not make changes.
What does self-describing mean in a database system?
A database system is referred to as self-describing because it not only contains the database itself, but also metadata which defines and describes the data and relationships between tables in the database.
What is a view in a database?
A subset of the database.
