Ch. 2
The hierarchical data model was developed in the _____.
1960s
Which of the following types of HDFS nodes acts as the interface between the user application and the HDFS?
Client node
Which of the following is true of business rules?
They can serve as a communication tool between the users and designers.
A(n) _____ is a restriction placed on the data.
constraint
A(n) _____ represents a particular type of object in the real world.
entity
The _____ model uses the term connectivity to label the relationship types.
entity relationship
The _____ model was developed to allow designers to use a graphical tool to examine structures rather than describing them with text.
entity relationship
VMS/VSAM is an example of the _____.
file system data model
Students and classes have a _____ relationship.
many-to-many
The _____ data model is said to be a semantic data model.
object-oriented
A(n) _____ is bidirectional.
relationship
_____ are important because they help to ensure data integrity.
Constraints
Which of the following is true of NoSQL databases?
They are not based on the relational model.
A noun in a business rule translates to a(n) _____ in the data model.
entity
A(n) _____ is the equivalent of a field in a file system.
attribute
In the _____ model, each parent can have many children, but each child has only one parent.
hierarchical
The relational data model was developed in the _____.
1970s
The object-oriented data model was developed in the _____.
1980s
_____ are normally expressed in the form of rules.
Constraints
A(n) _____'s main function is to help one understand the complexities of the real-world environment.
model
In the _____ model, the user perceives the database as a collection of records in 1:M relationships, where each record can have more than one parent.
network
In the _____ model, the basic logical structure is represented as an upside-down tree.
hierarchical
The _____ data model uses the concept of inheritance.
object-oriented
Which of the following types of HDFS nodes stores all the metadata about a file system?
Name node
Oracle 12c, MS SQL Server, and Tamino are examples of _____ data models.
XML Hybrid
A(n) _____ enables a database administrator to describe schema components.
data definition language (DDL)
A(n) _______ enables a database administrator to describe schema components.
data definition language (DDL)
A(n) _____ is anything about which data are to be collected and stored.
entity
MySQL is an example of the _____.
relational data model
A verb associating two nouns in a business rule translates to a(n) _____ in the data model.
relationship
