6032847
Descripción
Test por Angel Perez, actualizado hace más de 1 año
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Creado por Angel Perez
hace más de 8 años
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Pregunta 1
Pregunta
Internet databases can store which types of data?
Respuesta
-
pictures
-
audio
-
text
-
video
-
all of the above
Pregunta 2
Pregunta
A program whose job is to store and retrieve user data in the database is called the __________.
Respuesta
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Database Modeling System
-
Database Management System
-
Data Business Model System
-
Relational Model Manager
-
Data Business Management Service
Pregunta 3
Pregunta
Multi-user databases:
Respuesta
-
allow more than one concurrent user
-
must keep one user’s work from interfering with another’s
-
allow each user to make changes independently
-
both a and b
-
both a and c
Pregunta 4
Pregunta
The first applications of database technology were _______________.
Respuesta
-
Internet databases
-
workgroup databases
-
organizational databases
-
personal databases
-
file-processing systems
Pregunta 5
Pregunta
Which of the following is not a type of multi-user database?
Respuesta
-
Internet databases
-
workgroup databases
-
organizational databases
-
personal databases
-
both a and d
Pregunta 6
Pregunta
For database systems needing to support approximately 15 concurrent users within an organization, which type of database would be appropriate?
Respuesta
-
Internet database
-
workgroup database
-
organizational database
-
personal database
-
none of the above
Pregunta 7
Pregunta
Which of the following is not a characteristic of Internet databases?
Respuesta
-
can support no more than 50 concurrent users
-
contain structured data
-
contain nonstructured data
-
application content is delivered via a standard browser
-
uses web-oriented technology to transfer data
Pregunta 8
Pregunta
Which of the following is a technology that can be used in delivering data with an Internet database?
Respuesta
-
FTP
-
SMTP
-
XML
-
PTL
-
HTP
Pregunta 9
Pregunta
In a database application processing system:
Respuesta
-
the database application(s) interact(s) with the DBMS
-
the database application(s) access(es) the database data
-
the DBMS accesses the database data
-
a and b
-
a and c
Pregunta 10
Pregunta
Which of the following is not a limitation of file-processing systems?
Respuesta
-
Much data is duplicated.
-
Data integrity is high.
-
Application programs are dependent on file formats.
-
Data are separated and isolated.
-
All of the above are limitations of file-processing systems.
Pregunta 11
Pregunta
In a file-processing system:
Respuesta
-
the user interacts with the application
-
the user accesses the file data
-
the application accesses the file data
-
a and b
-
a and c
Pregunta 12
Pregunta
When data are duplicated, the most serious problem is:
Respuesta
-
storage space is wasted
-
data may be in different formats
-
the data may not be logically consistent
-
the files may be of different sizes
-
difficulty in representing the users’ perspectives
Pregunta 13
Pregunta
In file-processing systems, the physical file formats are:
Respuesta
-
contained in the metadata
-
contained in the application code
-
contained in the application metadata
-
contained in the DBMS
-
not needed by the application programs
Pregunta 14
Pregunta
In file-processing systems, the physical file formats are dependent on:
Respuesta
-
the language or product used to generate them
-
the type of data being stored
-
the DBMS
-
the size of the file
-
the user’s preference
Pregunta 15
Pregunta
As compared to file-processing systems, database processing systems:
Respuesta
-
make application programming easier
-
maximize the impact of data format changes on application programs
-
provide users with direct access to data
-
both a and c
-
none of the above
Pregunta 16
Pregunta
In database processing systems:
Respuesta
-
all record formats are stored in the database
-
application programs need not include the format of the records or files they process
-
application programs need to know the length and data type of the data items they need from the database
-
the impact of data format changes on application programs is minimized
-
all of the above
Pregunta 17
Pregunta
A database is considered “self-describing” because:
Respuesta
-
all the users’ data is in one place
-
it reduces data duplication
-
it contains a description of its own structure
-
it contains a listing of all the programs that use it
-
all of the above
Pregunta 18
Pregunta
The description of the structure of a database is called:
Respuesta
-
user data
-
data dictionary
-
indexes
-
application metadata
-
application data
Pregunta 19
Pregunta
The standard hierarchy of data, from smallest to largest, is as follows:
Respuesta
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bytes, characters, fields, records, files
-
bits, characters, fields, records, files
-
bits, characters, fields, files, records
-
bits, characters, records, databases, files
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bits, characters, fields, files, databases
Pregunta 20
Pregunta
A database contains:
Respuesta
-
user data
-
metadata
-
indexes
-
application metadata
-
all of the above
Pregunta 21
Pregunta
An index is used to:
Respuesta
-
represent relationships among the data
-
describe the structure of the database itself
-
describe the application programs that use the database
-
describe the structure of a data entry form or report
-
a and c
Pregunta 22
Pregunta
An index can be used to:
Respuesta
-
document the structure of the database itself
-
improve the performance of the database
-
reduce data dependency for application programs
-
better represent the users’ perspectives of the data
-
all of the above
Pregunta 23
Pregunta
When the structure of a data entry form or a report is part of a database, it is called:
Respuesta
-
user data
-
metadata
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indexes
-
application metadata
-
none of the above
Pregunta 24
Pregunta
A database is a model of:
Respuesta
-
the actual business
-
the users’ model of the business
-
the programmers’ view of the business
-
reality as it relates to the business
-
all of the above
Pregunta 25
Pregunta
The principal criterion for determining the level of detail incorporated in a database is:
Respuesta
-
the number of sample forms available during the design process
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the level of detail of the structure of the database
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the level of detail that exists in the users’ minds
-
the degree of detail available in the metadata
-
none of the above
Pregunta 26
Pregunta
Events that must be processed against the database are called _____________.
Respuesta
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instances
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dynamics
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representations
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referrals
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transactions
Pregunta 27
Pregunta
Which of the following was not a factor in organizations’ interest in the initial development of database technology?
Respuesta
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organizations were producing data at phenomenal rates
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data was difficult to manage with file-processing systems
-
new systems were becoming increasingly difficult to develop
-
the desire to separate and isolate data according to application programs
-
the desire to integrate data from different file systems
Pregunta 28
Pregunta
Which of the following was not a disadvantage of early database technologies?
Respuesta
-
inability to integrate data
-
database applications were unreliable
-
database application performance was slow
-
vulnerability of having a single point of failure for all data
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b and c
Pregunta 29
Pregunta
Which of the following is not an advantage of the relational model?
Respuesta
-
data duplication is minimized
-
many processing errors can be eliminated
-
most users can obtain information from the database themselves
-
provides a standard way for specialists to structure and process databases
-
all of the above are advantages of the relational model
Pregunta 30
Pregunta
Modern microcomputer DBMS products:
Respuesta
-
are not truly relational
-
provide easy to use interfaces
-
have poor response time
-
are not true DBMS products
-
are really just programming languages with generalized file-processing capabilities
Pregunta 31
Pregunta
Client-server database architecture:
Respuesta
-
has one CPU involved in the processing of database applications
-
has many CPUs simultaneously involved in processing database applications
-
is a simple but less robust mode of database processing on a LAN
-
is the same as the multi-user architecture used on mainframe databases
-
both a and d
Pregunta 32
Pregunta
The term “Internet database” refers to which of the following?
Respuesta
-
any database joined with Internet technology to publish database data on the web
-
any database that uses HTTP to publish database data to any location
-
any database joined with XML to publish database data to any location
-
any database joined with DHTML and XML to publish database data to any location
-
all of the above
Pregunta 33
Pregunta
Which of the following is not true about distributed databases?
Respuesta
-
They can combine personal, workgroup, and organizational databases.
-
They are widely used by large international corporations.
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They make it appear to each user that (s)he is the only user of the organizations’ data.
-
They are still dealing with issues of data security.
-
It is still unknown if truly distributed databases can meet the needs of day-to-day organizational processing.
Pregunta 34
Pregunta
Business organizations have resisted adopting object-oriented database systems because:
Respuesta
-
object-oriented programming uses simplified data structures that fit easily into relational databases
-
the cost of purchasing ODBMS packages is prohibitively high
-
the cost and risk of converting from relational databases to OBMS format is too high
-
most ODBMS products lack features and functions for business information applications
-
both c and d
Pregunta 35
Pregunta
A relation:
Respuesta
-
is a tree containing user data
-
is a table containing user data
-
contains records in columns
-
is always well structured
-
all of the above
Pregunta 36
Pregunta
A relation:
Respuesta
-
has columns containing attributes
-
has rows containing records
-
should contain information on only one topic
-
has columns containing fields
-
all of the above
Pregunta 37
Pregunta
The process to convert a poorly structured relation into a well-structured relation is called ________.
Respuesta
-
decomposition
-
structuration
-
transformation
-
transaction
-
normalization
Pregunta 38
Pregunta
Which of the following would not be stored in system tables?
Respuesta
-
user data
-
keys
-
stored procedures
-
lists of indexes
-
length of fields
Pregunta 39
Pregunta
Which of the following is (are) considered “overhead data”?
Respuesta
-
metadata
-
keys
-
linked lists
-
user data
-
application metadata
Pregunta 40
Pregunta
An index is a type of ____________.
Respuesta
-
database
-
metadata
-
stored procedure
-
overhead data
-
primary key
Pregunta 41
Pregunta
Indexes can:
Respuesta
-
assist in search operations
-
improve performance of sorting operations
-
slow performance of update operations
-
improve the accessibility of the database data
-
all of the above
Pregunta 42
Pregunta
Application metadata can include the structure of all of the following except ______________.
Respuesta
-
indexes
-
forms
-
queries
-
reports
-
application components
Pregunta 43
Pregunta
The design tools subsystem of the DBMS usually provides ________________.
Respuesta
-
tools for backup and recovery of the database
-
one or more programming languages
-
a DBMS engine
-
a component to process queries
-
a banded report
Pregunta 44
Pregunta
The design tools subsystem of the DBMS typically includes tools for creating all of the following except ____________.
Respuesta
-
forms
-
tables
-
reports
-
queries
-
engines
Pregunta 45
Pregunta
Which DBMS subsystem is responsible for processing the application components?
Respuesta
-
DBMS engine
-
schema subsystem
-
run-time subsystem
-
design tools subsystem
-
programming interfaces
Pregunta 46
Pregunta
Which DBMS subsystem is responsible for receiving requests from the other components and translating them into commands for the operating system to read or write data on the physical media?
Respuesta
-
DBMS engine
-
schema subsystem
-
run-time subsystem
-
design tools subsystem
-
programming interfaces
Pregunta 47
Pregunta
The DBMS engine is directly involved in all of the following except _____________.
Respuesta
-
locking
-
recovery
-
domains
-
backup
-
transaction management
Pregunta 48
Pregunta
The database schema defines which of the following?
Respuesta
-
domains
-
tables
-
relationships
-
business rules
-
all of the above
Pregunta 49
Pregunta
Which of the following steps in creating a database would come first?
Respuesta
-
define relationships
-
create tables
-
define the schema
-
generate the data entry form
-
format reports
Pregunta 50
Pregunta
The set of values that a column can have is called the ___________.
Respuesta
-
domain
-
business rules
-
schema
-
relation
-
uniqueness
Pregunta 51
Pregunta
Business rules may be enforced by all of the following methods except ____________.
Respuesta
-
by the DBMS
-
by the indexes
-
by stored procedures
-
by the application programs
-
all of the above can be used to enforce business rules
Pregunta 52
Pregunta
____________ are constraints on user activities that must be enforced no matter how the data changes reach the DBMS.
Respuesta
-
Domains
-
Business rules
-
Schema
-
Relationships
-
Keys
Pregunta 53
Pregunta
When the primary key of one relation is placed into a second relation to define a relationship, the key is called a(n) ___________ in the second relation.
Respuesta
-
primary key
-
secondary key
-
foreign key
-
duplicate key
-
surrogate key
Pregunta 54
Pregunta
Which of the following is not considered part of a database application?
Respuesta
-
tables
-
reports
-
application programs
-
forms
-
queries
Pregunta 55
Pregunta
In a database application, data entry is typically done with a(n) _____________.
Respuesta
-
report
-
metadata
-
query
-
form
-
table
Pregunta 56
Pregunta
A surrogate key:
Respuesta
-
represents an attribute of an entity in the users’ model
-
always appears as the first line of a banded report
-
can be used in queries, but not in tables
-
has no meaning to the users
-
all of the above
Pregunta 57
Pregunta
Which of the following is not a means of expressing a query to a database?
Respuesta
-
PBL
-
SQL
-
QBE
-
query by form
-
query by example
Pregunta 58
Pregunta
A report:
Respuesta
-
can be easier to design than a form since it is used only for displaying data
-
can be more difficult to design than a form because it usually has a more complex structure
-
is a formatted display of database data
-
both a and c
-
all of the above
Pregunta 59
Pregunta
Menus can be used to:
Respuesta
-
display database data
-
control the users’ activities
-
retrieve specific data from the database
-
update database data
-
express a query to the database
Pregunta 60
Pregunta
Application programs:
Respuesta
-
must be written in a language specific to the DBMS being used
-
can be used to enforce business rules
-
can use a predefined program interface to bypass the DBMS and access data directly
-
can not be written in standard programming languages
-
all of the above
Pregunta 61
Pregunta
Which of the following is not true of application programs?
Respuesta
-
may be written in a language specific to the DBMS being used
-
may be written in a standard programming language using a predefined program interface
-
may enforce business rules
-
interact with the DBMS to access database data
-
are always dependent on a set of forms and reports
Pregunta 62
Pregunta
A prototype is:
Respuesta
-
a completed database without any applications
-
a completed application without any database
-
created by the users to explain their model to the developers
-
a sample database and applications to represent aspects of the system
-
used only with top-down development
Pregunta 63
Pregunta
Which of the following is not a characteristic of top-down development?
Respuesta
-
involves a study of strategic goals
-
creates an abstract data model
-
identifies a number of systems to eventually be built
-
produces systems requiring little modification to interface with new systems
-
produces useful systems quickly
Pregunta 64
Pregunta
Which of the following is a characteristic of bottom-up development?
Respuesta
-
involves a study of strategic goals
-
begins with the need to develop a specific system
-
identifies a number of systems to eventually be built
-
produces systems requiring little modification to interface with new systems
-
often leads to analysis paralysis
Pregunta 65
Pregunta
Capturing the users’ requirements typically involves all of the following except:
Respuesta
-
making inferences
-
interviewing users
-
building prototypes
-
examining reports
-
all of the above
Pregunta 66
Pregunta
Data modeling in a multi-user system is complicated because:
Respuesta
-
conflicting models must be reconciled
-
no single user’s model includes the complete structure
-
the developers must document the logical union of different models
-
users’ models may be inconsistent with each other
-
all of the above
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