Exam 1 308N
A property or characteristic of an entity type that is of interest to the organization is called a(n):
Attribute
A person's name, birthday, and social security number are all examples of:
Attributes
A ________ defines or constrains some aspect of the business.
Business rule
A ________ specifies the number of instances of one entity that can be associated with each instance of another entity.
Cardinality constraint
Which of the following criteria should be considered when selecting an identifier?
Choose an identifier that doesn't have large composite attributes
An attribute that can be broken down into smaller parts is called a(n) ________ attribute.
Composite
Which organizational function should set database standards?
Database Administration
Which of the following is software used to create, maintain, and provide controlled access to databases?
Database management system (DBMS)
The number of entity types that participate in a relationship is called the:
Degree
An attribute that can be calculated from related attribute values is called a ________ attribute.
Derived
The total quiz points for a student for an entire semester is a(n) ________ attribute.
Derived
A constraint is a rule in a database system that can be violated by users.
False
A customer can order many items, and an item can be ordered by many customers is an example of a recursive relationship.
False
A simple attribute can be broken down into smaller pieces.
False
A well-structured database establishes the entities between relationships in order to derive the desired information.
False
Data names do not have to be unique.
False
Database development begins with the design of the database.
False
Databases were developed as the first application of computers to data processing
False
In an E-R diagram, strong entities are represented by double-walled rectangles.
False
Most systems developers believe that data modeling is the least important part of the systems development process.
False
The steps of the systems development life cycle can only be viewed as a linear process.
False
The data that you are interested in capturing about an entity is called an instance.
False (note: it's called attribute)
Which of the following is NOT a cost and/or risk of the database approach?
Improved responsiveness
A relationship where the minimum and maximum cardinality are both one is a(n) ________ relationship.
Mandatory one
The number of entity types that participate in a Unary relationship is:
One
Which of the following is NOT an advantage of database systems?
Redundant data
Which of the following is NOT a good characteristic of a data name?
Relates to a technical characteristic of the system
________ are established between entities in a well-structured database so that the desired information can be retrieved.
Relationships
Which of the following is an entity that exists independently of other entity types?
Strong
________ is a tool even non-programmers can use to access information from a database.
Structured query language
The traditional methodology used to develop, maintain, and replace information systems is called the:
Systems Development Life Cycle
A fact is an association between two or more:
Terms
A major difference between data warehouses and transactional systems as compared to big data is:
The data is unstructured in big data systems.
A value that indicates the date or time of a data value is called a:
Time stamp
A business rule is a statement that defines or constrains some aspect of the business.
True
A data model is a graphical system used to capture the nature and relationships among data.
True
A good data definition is always accompanied by diagrams, such as the entity-relationship diagram.
True
A multivalued attribute may take on more than one value for a particular entity instance.
True
A person is an example of an entity.
True
A relational database establishes the relationships between entities by means of a common field
True
A single occurrence of an entity type is called an entity instance.
True
A time stamp is a time value that is associated with a data value.
True
An attribute whose values can be calculated from related attribute values is called a derived attribute.
True
An entity is a person, place, object, event, or concept in the user environment about which the organization wishes to maintain data.
True
An entity type name should always be a singular noun.
True
Data modeling is about documenting rules and policies of an organization that govern data
True
Data names should always relate to business characteristics.
True
Data, rather than processes, are the most complex aspects of many modern information systems
True
Development starts from scratch with the traditional file processing approach because new file formats, descriptions, and file access logic must be designed for each new program.
True
Enterprise modeling sets the range and general contents of organizational databases.
True
File processing systems have been replaced by database systems in most critical business applications today.
True
Information is processed data.
True
It is desirable that no two attributes across all entity types have the same name.
True
Many of the disadvantages of file processing systems can also be limitations of databases
True
Metadata are data that describe the properties of other data.
True
One of the roles of a database analyst is to identify and understand rules that govern data.
True
Relationships represent action being taken using a verb phrase.
True
Separation of metadata from application programs that use the data is called data independence.
True
The E-R model is used to construct a conceptual model.
True
The data repository assists database administrators in enforcing standards.
True
The user interface includes languages, menus, and other facilities by which users interact with various system components
True
Unplanned duplicate data files are the rule rather than the exception in file processing systems.
True
When choosing an identifier, choose one that will not change its value often.
True
A relationship between the instances of a single entity type is called a ________ relationship.
Unary
A(n) ________ is often developed by identifying a form or report that a user needs on a regular basis.
User View
An entity type whose existence depends on another entity type is called a ________ entity.
Weak
A user view is:
a logical description of some portion of the database.
The SDLC phase in which every data attribute is defined, every category of data is listed, and every business relationship between data entities is defined is called the ________ phase.
analysis
In a file processing environment, descriptions for data and the logic for accessing the data are built into:
application programs
An entity type name should be all of the following EXCEPT:
as short as possible
An entity that associates the instances of one or more entity types and contains attributes peculiar to the relationships is called a(n):
associative entity
An attribute that uniquely identifies an entity and consists of a composite attribute is called a(n):
composite identifier
A rule that CANNOT be violated by database users is called a:
constraint
A graphical system used to capture the nature and relationships among data is called a(n):
data model
An attribute of an entity that is computed is a(n):
derived attribute
Database management involves all of the following EXCEPT:
design web pages
Database development begins with ________, which establishes the range and general contents of organizational databases.
enterprise data modeling
Customers, cars, and parts are examples of:
entities
A person, place, object, event, or concept about which the organization wishes to maintain data is called a(n):
entity
The logical representation of an organization's data is called a(n):
entity-relationship model
Data redundancy is used to establish relationships between data but is never used to improve database performance.
false
A(n) ________ is the relationship between a weak entity type and its owner.
identifying relationship
The SDLC phase in which database processing programs are created is the ________ phase.
implementation
Metatdata typically describes all of the following EXCEPT:
location on disk
A database is an organized collection of ________ related data.
logically
Business policies and rules govern all of the following EXCEPT:
managing employees
A student can attend five classes, each with a different professor. Each professor has 30 students. The relationship of students to professors is a ________ relationship.
many-to-many
Data that describe the properties of other data are:
metadata
Legacy systems often contain data of ________ quality and are generally hosted on ________.
poor; mainframes
All of the following are primary purposes of a database management system (DBMS) EXCEPT:
providing an integrated development environment
Relational databases establish the relationships between entities by means of common fields included in a file called a(n):
relation
A centralized knowledge base of all data definitions, data relationships, screen and report formats, and other system components is called a(n):
repository
A knowledge base of information or facts about an enterprise is called a(n):
repository
With the database approach, data descriptions are stored in a central location known as a:
repository
An attribute that must be present for every entity (or relationship) instance is a(n):
required attribute
A departmental multi-tiered client/server database is stored on a central device called a:
server
The most common types of entities are:
strong entities
Because applications are often developed independently in file processing systems:
unplanned duplicate data files are the rule rather than the exception.
Languages, menus, and other facilities by which users interact with the database are collectively called a(n):
user interface
A good data definition will describe all of the characteristics of a data object EXCEPT:
who can delete the data
