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CS403 Database Management System Quiz 1 Solved Fall 2012

Within a table, each primary key value __.
Select correct option:
is a minimal super key
is always the first field in each table
must be numeric
must be unique

Foreign Key is

Select correct option:
A field in a table that matches a key field in another table
A field in a table that contains data that is also contained elsewhere in another table
A field in a table that has the same name as a key field in another table

 

The Entity Relation Model models
Select correct option:
Entities, Relationships and Processes
Entities and Relationships
Relationships
Entities

Database Application is a program which is used for performing certain operations such as

 

Which levels are mostly used for Detailed DFD?
Select correct option:

Level-0, Level-1
Level-1, Level-2
Level-2, Level-3
Level-3, Level-4

Level of data at which entities or objects exist in reality is called

Real world data
Schema for real world data
Meta data
Data about data

Which model operates at the lowest level of abstraction?

conceptual
internal
external
physical

A table can be logically connected to another table by defining a ____.

hyperlink
common attribute
primary key
superkey

 

Which of the following is NOT a component of a DFD?
Select correct option:

Dataflow
Datastore
External entities
Relationship between external entities

 

A________is used to maintain a connection between the users of the database system.
Select correct option:

mail server
file server
client-server
none of the given

 

 

An instance is
Select correct option:

a particular occurance of an entity
a special type of relation
an attribute of an entity
any particular entity

 

 

A primary key is an attribute (or set of attributes) that has been chosen for an entity, whose values are used to uniquely identify a particular instance of an entity. True or false?

True
False
Partially True
None of the given

 

ncase of Context-level Diagram, the system is represented by

One process atleast
Two processes atleast
One process only
Any number of processes

 

An entity type is

defined when the database is actually constructed
a specific type such as an integer, text, date, logical etc
a coherent set of similar objects that we want to store data on (e.g. STUDENT, COURSE, CAR)
defined by the database designer

Data about data is database

True
False
Partially True
None of the Above

 

 

A software package designed to store and manage databases

Database
DBMS
Data model
Data

 

 

A relational database is

 

one that consists of two or more tables
a database that is able to process tables, queries, forms, reports and macros
one that consists of two or more tables that are joined in some way
the same as a flat file database

 

Which model operates at the lowest level of abstraction?

conceptual
internal
external
physical

 

 

An entity type is

defined when the database is actually constructed
a specific type such as an integer, text, date, logical etc
a coherent set of similar objects that we want to store data on (e.g. STUDENT, COURSE, CAR)
defined by the database designer

Data about data is database

True
False
Partially True
None of the Above

 

 

A table can be logically connected to another table by defining a __.

hyperlink
common attribute
primary key
superkey

 

Which of the following is INCORRECT statement concerning the database design process?

During requirements collection and analysis phase, one can gather the data requirements of database users.
By referring to a high level data model, it is possible to understand the data requirements of the users, entity types, relationships and constraints.
Transformation of the high level data model into the implementation data model is called logical design or data model mapping.
During the logical design phase of internal storage structures, access paths and file organization for the database files are specified.

 

 

Which of the following is correct regarding Dataflow diagram?

Single DFD is required to represent a system
Created at increasing levels of detail
The dataflow must be bidirectional
Used to represent the relationships among the external entities

 

A collection of concepts that can be used to describe the structure of a database
Database
DBMS
Data model
Data

 

Who is responsible for authorizing access to the database, for coordinating and monitoring its use?
Select correct option:

Database Designer
Database Administrator
End User
Application Programmer

 

A software package designed to store and manage databases
Select correct option:

Database
DBMS
Data model
Data

 

 

The main software package that supports a database management approach is called
Select correct option:

Data Dictionary
Report Generator
Database Management System
Distributed database

 

 

A primary key is an attribute (or set of attributes) that has been chosen for an entity, whose values are used to uniquely identify a particular instance of an entity. True or false?
Select correct option:

True
False
Partially True
None of the given

 

 

 

The ER model is meant to
Select correct option:

replace relational design
be close to a users perception of the data
enable low level descriptions of data
enable detailed descriptions of data query processing

 

Which feature of database provides conversion from inconsistent state of DB to a consistent state ensuring minimum data loss?
Select correct option:

User accessible catalog
Data processing
Recovery service
Authorization service

A relational database system is based on the concept(s) of:
Select correct option:

A network of data records
Nested tables
Tables, rows and columns
A tree-like structure of datas

 

Question # 1 of 10 ( Start time: 05:35:55 PM ) Total M a r k s: 1
Controlling redundancy in a database management system DOES NOT help to
Select correct option:
avoid duplication
avoid unnecessary wastage of storage space
avoid unauthorised access to data
avoid inconsistency among data

 

 

 

Making a change to the conceptual schema of a database but not affecting the existing external schemas is an example of
Select correct option:
Physical data independence
Logical data independence
Functional dependency
Concurrency control

 

 

 

A description on a particular collection of data using the given data model
Select correct option:
Database
Relation
Schema
None

 

 

 

 

Which of the following functions are NOT performed by a database administrator?
Select correct option:
Planning, designing and implementing database systems
Establishing standards and procedures for database systems
Communicating with database users
Allocation of storage locations and data structures

 

 

 

A collection of concepts that can be used to describe the structure of a database
Select correct option:
Database
DBMS
Data model
Data

 

 

A candidate key that does not have a null value and is selected to uniquely identify all other attribute values in any given row is called a __.
Select correct option:
superkey
candidate key
primary key
secondary key

 

Question # 1 of 10 ( Start time: 11:17:22 AM )        Total Marks: 1

Controlling redundancy in a database management system DOES NOT help to

Select correct option:

 

avoid duplication

avoid unnecessary wastage of storage space

avoid unauthorised access to data

avoid inconsistency among data

 

Quiz Start Time: 11:17 AM               Time Left        43sec(s)

Question # 2 of 10 ( Start time: 11:18:38 AM )        Total Marks: 1

User rights information is stored in

Select correct option:

 

Physical database

Catalog

Logical database

Buffer

 

 

Quiz Start Time: 11:17 AM               Time Left        38

Question # 3 of 10 ( Start time: 11:20:08 AM )        Total Marks: 1

Which levels are mostly used for Detailed DFD?

Select correct option:

 

Level-0, Level-1

Level-1, Level-2

Level-2, Level-3

Level-3, Level-4

 

 

 

Quiz Start Time: 11:17 AM               Time Left        76

Question # 4 of 10 ( Start time: 11:21:13 AM )        Total Marks: 1

Within a table, each primary key value ____.

Select correct option:

is a minimal superkey

is always the first field in each table

must be numeric

must be unique

 

Quiz Start Time: 11:17 AM               Time Left        68

Question # 5 of 10 ( Start time: 11:21:45 AM )        Total Marks: 1

A primary key is an attribute (or set of attributes) that has been chosen for an entity, whose values are used to uniquely identify a particular instance of an entity. True or false?

Select correct option:

True

False

Partially True

None of the given

 

Quiz Start Time: 11:17 AM               Time Left        54

Question # 6 of 10 ( Start time: 11:22:28 AM )        Total Marks: 1

Who is responsible for authorizing access to the database, for coordinating and monitoring its use?

Select correct option:

Database Designer

Database Administrator

End User

Application Programmer

 

 

Quiz Start Time: 11:17 AM               Time Left        52

Question # 8 of 10 ( Start time: 11:24:50 AM )        Total Marks: 1

Incase of Context-level Diagram, the system is represented by

Select correct option:

One process atleast

Two processes atleast

One process only

Any number of processes

 

Quiz Start Time: 11:17 AM               Time Left        77

Question # 9 of 10 ( Start time: 11:25:39 AM )        Total Marks: 1

In a three-level DBMS architecture, the ______ level interacts directly with the users.

Select correct option:

 

external

conceptual

internal

physical

 

 

Quiz Start Time: 11:17 AM               Time Left        68

Question # 10 of 10 ( Start time: 11:26:04 AM )      Total Marks: 1

Which feature of database provides conversion from inconsistent state of DB to a consistent state ensuring minimum data loss?

Select correct option:

 

User accessible catalog

Data processing

Recovery service

Authorization service

Which feature of database provides conversion from inconsistent state of DB to a

consistent state ensuring minimum data loss?
Select correct option:

User accessible catalog
Data processing
Recovery service 100%
Authorization service

 

A relational database system is based on the concept(s) of:
Select correct option:
A network of data records
Nested tables
Tables, rows and columns  100%
A tree-like structure of datas

 

Allocation of storage locations and data structures

A collection of concepts that can be used to describe the structure of a database
Select correct option:
Database
DBMS
Data model
Data

 

Making a change to the conceptual schema of a database but not affecting the existing external schemas is an example of
Select correct option:
Physical data independence
Logical data independence      100%
Functional dependency
Concurrency control

 

A candidate key that does not have a null value and is selected to uniquely identify all other attribute values in any given row is called a __.
Select correct option:
super key
candidate key
primary key 100%
secondary key

Which model operates at the lowest level of abstraction?

Select correct option:
conceptual
internal
external
physical  100%

 

An entity type is
defined when the database is actually constructed
specific type such as an integer, text, date, logical etc
coherent set of similar objects that we want to store data on (e.g. STUDENT, COURSE, CAR)
defined by the database designer

 

Data Redundancy Means
Select correct option:
Security of data
Duplication of data  100%
Management of data
Recovery of data

 

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