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DBMS MCQ QUESTIONS
MODEL PAPER –10
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1. In a DBMS, what is an
instance?
a. A specific record in a table
b. A specific field in a record
c. A specific row in a database
d. A specific occurrence of a database at a particular moment in time
Answer: d. A specific occurrence of a database at a particular moment in
time
2. What is the purpose of the
term "instance" in the context of a database?
a. It refers to the overall structure of the database
b. It represents a snapshot of the database at a specific point in
time
c. It is synonymous with a table in the database
d. It denotes the relationships between tables
Answer: b. It represents a snapshot of the database at a specific point
in time
3. In a relational database, what
does an instance refer to?
a. A specific record in a table
b. A specific field in a record
c. A specific row in a database
d. A specific occurrence of a database schema
Answer: c. A specific row in a database
4. What is the significance of an
instance in the context of a database schema?
a. It represents the overall structure of the database
b. It defines the relationships between tables
c. It is a specific occurrence of the database schema at a particular
moment in time
d. It is a synonym for a database table
Answer: c. It is a specific occurrence of the database schema at a
particular moment in time
5. In the context of a DBMS, what
does the term "instance variable" typically refer to?
a. A variable that represents a specific record in a table
b. A variable that represents a specific field in a record
c. A variable that represents a specific row in a database
d. A variable that is associated with a specific instance of an object
Answer: d. A variable that is associated with a specific instance of an
object
6. In a relational database, what
is a tuple in the context of an instance?
a. A specific record in a table
b. A specific field in a record
c. A specific row in a database
d. A specific occurrence of a database schema
Answer: a. A specific record in a table
7. What does the term
"instance" imply in the context of object-oriented databases (OODB)?
a. A specific record in a table
b. A specific field in a record
c. A specific row in a database
d. A specific occurrence of an object with its attributes and methods
Answer: d. A specific occurrence of an object with its attributes and
methods
8. In a database management
system, what is the role of the term "instance level" in security?
a. It represents a specific record in a table
b. It defines the relationships between tables
c. It refers to the overall structure of the database
d. It pertains to security settings applied to a specific instance of a
database
Answer: d. It pertains to security settings applied to a specific
instance of a database
9. What is the primary
characteristic of an instance in a DBMS?
a. It is static and unchanging
b. It represents a snapshot of the database at a specific point in
time
c. It is synonymous with a table in the database
d. It denotes the relationships between tables
Answer: b. It represents a snapshot of the database at a specific point
in time
10. In the context of a
relational database, what does "instance-based schema" mean?
a. A schema that represents the overall structure of the database
b. A schema that defines relationships between tables
c. A schema that is specific to a particular instance of the
database
d. A schema that is synonymous with a database table
Answer: c. A schema that is specific to a particular instance of the
database
11. How does an instance differ
from a schema in a DBMS?
a. An instance is a specific occurrence of a database schema at a
particular moment in time, while a schema is a blueprint for the database
structure
b. An instance represents the overall structure of the database, while a
schema represents a specific occurrence of the database
c. An instance and a schema are synonymous terms and can be used
interchangeably
d. An instance is a specific record in a table, while a schema is a
specific row in a database
Answer: a. An instance is a specific occurrence of a database schema at
a particular moment in time, while a schema is a blueprint for the database
structure
12. In a DBMS, what is the
purpose of taking a database instance backup?
a. To represent the overall structure of the database
b. To store a specific record in a table
c. To create a snapshot of the database at a specific point in time
d. To define the relationships between tables
Answer: c. To create a snapshot of the database at a specific point in
time
13. In a DBMS, what is an example
of an instance-based operation?
a. Creating a database schema
b. Inserting a specific record into a table
c. Defining relationships between tables
d. Representing the overall structure of the database
Answer: b. Inserting a specific record into a table
14. What does the term
"instance identifier" typically refer to in a DBMS?
a. A variable that represents a specific record in a table
b. A unique identifier for a specific occurrence of the database
schema
c. A variable that represents a specific row in a database
d. A variable that is associated with a specific instance of an object
Answer: b. A unique identifier for a specific occurrence of the database
schema
15. In the context of databases,
what is the significance of an "instance variable" in programming
languages?
a. A variable that represents a specific record in a table
b. A variable that represents a specific field in a record
c. A variable that is associated with a specific instance of an
object
d. A variable that defines the relationships between tables
Answer: c. A variable that is associated with a specific instance of an
object
16. What does the term
"instance-based security" refer to in a DBMS?
a. Security settings applied to a specific record in a table
b. Security settings applied to a specific field in a record
c. Security settings applied to a specific row in a database
d. Security settings applied to a specific occurrence of a database
schema
Answer: c. Security settings applied to a specific row in a database
17. In a DBMS, what is an example
of an instance-level operation?
a. Creating a database schema
b. Inserting a specific record into a table
c. Defining relationships between tables
d. Representing the overall structure of the database
Answer: b. Inserting a specific record into a table
18. How does the concept of an
instance relate to the concept of a snapshot in a database?
a. An instance is a static representation, while a snapshot is a dynamic
representation
b. An instance and a snapshot are synonymous terms and can be used
interchangeably
c. An instance is a specific occurrence of a database schema, and a
snapshot is a representation at a specific point in time
d. An instance represents the overall structure of the database, while a
snapshot represents a specific occurrence of the database
Answer: c. An instance is a specific occurrence of a database schema,
and a snapshot is a representation at a specific point in time
19. In a DBMS, what is the role
of an instance variable in programming languages?
a. To represent the overall structure of the database
b. To store a specific record in a table
c. To create a snapshot of the database at a specific point in time
d. To store information associated with a specific instance of an object
Answer: d. To store information associated with a specific instance of
an object
20. What is the primary function
of a tuple in the context of a database instance?
a. To represent the overall structure of the database
b. To define relationships between tables
c. To store a specific record in a table
d. To create a snapshot of the database at a specific point in time
Answer: c. To store a specific record in a table
21. In a DBMS, what is an example
of an instance identifier?
a. A variable that represents a specific record in a table
b. A unique identifier for a specific occurrence of the database
schema
c. A variable that represents a specific row in a database
d. A variable that is associated with a specific instance of an object
Answer: b. A unique identifier for a specific occurrence of the database
schema
22. What is the significance of
an instance in the context of a database transaction?
a. An instance represents the overall structure of the database
b. An instance is synonymous with a table in the database
c. An instance is a specific occurrence of a database schema at a
particular moment in time
d. An instance denotes the relationships between tables
Answer: c. An instance is a specific occurrence of a database schema at
a particular moment in time
23. In a DBMS, what does
"instance-based indexing" refer to?
a. Indexing based on the overall structure of the database
b. Indexing based on a specific record in a table
c. Indexing based on a specific row in a database
d. Indexing based on a specific occurrence of a database schema
Answer: c. Indexing based on a specific row in a database
24. What is the primary role of
an instance in the context of database concurrency control?
a. To represent the overall structure of the database
b. To store a specific record in a table
c. To create a snapshot of the database at a specific point in time
d. To ensure the consistency of transactions involving a specific
occurrence of the database schema
Answer: d. To ensure the consistency of transactions involving a
specific occurrence of the database schema
25. In a DBMS, what is the
significance of an instance-based view?
a. A view representing the overall structure of the database
b. A view specific to a particular occurrence of the database schema at
a particular moment in time
c. A view synonymous with a database table
d. A view defining relationships between tables
Answer: b. A view specific to a particular occurrence of the database
schema at a particular moment in time
26. What is the primary purpose
of creating multiple instances in a distributed database system?
a. To increase data redundancy
b. To complicate user interactions with the database
c. To store multiple records in a table
d. To enhance performance and provide fault tolerance
Answer: d. To enhance performance and provide fault tolerance
27. In a DBMS, what is the role
of an instance-based trigger?
a. To represent the overall structure of the database
b. To store a specific record in a table
c. To create a snapshot of the database at a specific point in time
d. To automatically execute actions based on events related to a
specific occurrence of the database schema
Answer: d. To automatically execute actions based on events related to a
specific occurrence of the database schema
28. How does an instance differ
from a record in a database?
a. An instance is a specific occurrence of a database schema, while a
record is a static representation
b. An instance represents the overall structure of the database, while a
record represents a specific occurrence of the database schema
c. An instance and a record are synonymous terms and can be used
interchangeably
d. An instance is a specific record in a table, while a record is a
specific occurrence of a database schema
Answer: d. An instance is a specific record in a table, while a record
is a specific occurrence of a database schema
29. What is the significance of
an instance in the context of database replication?
a. An instance represents the overall structure of the database
b. An instance is synonymous with a table in the database
c. An instance is a specific occurrence of a database schema at a
particular moment in time
d. An instance facilitates the creation of copies of the database for
redundancy and performance purposes
Answer: d. An instance facilitates the creation of copies of the
database for redundancy and performance purposes
30. In a DBMS, what is the
primary function of an instance-based cursor?
a. To represent the overall structure of the database
b. To store a specific record in a table
c. To create a snapshot of the database at a specific point in time
d. To navigate and process data related to a specific occurrence of the
Answer: d.
31. In a DBMS, what does the term "instance-based view" refer
to?
a. A view representing the overall structure of the database
b. A view specific to a particular occurrence of the database schema at
a particular moment in time
c. A view synonymous with a database table
d. A view defining relationships between tables
Answer: b. A view specific to a particular occurrence of the database
schema at a particular moment in time
32. What is the primary goal of
creating database instances in a distributed environment?
a. To increase data redundancy
b. To complicate user interactions with the database
c. To store multiple records in a table
d. To distribute data and workload for improved performance and fault
tolerance
Answer: d. To distribute data and workload for improved performance and
fault tolerance
33. In a DBMS, what is the role
of an instance-based trigger?
a. To represent the overall structure of the database
b. To store a specific record in a table
c. To create a snapshot of the database at a specific point in time
d. To automatically execute actions based on events related to a
specific occurrence of the database schema
Answer: d. To automatically execute actions based on events related to a
specific occurrence of the database schema
34. How does an instance differ
from a record in a database?
a. An instance is a specific occurrence of a database schema, while a
record is a static representation
b. An instance represents the overall structure of the database, while a
record represents a specific occurrence of the database schema
c. An instance and a record are synonymous terms and can be used
interchangeably
d. An instance is a specific record in a table, while a record is a
specific occurrence of a database schema
Answer: d. An instance is a specific record in a table, while a record
is a specific occurrence of a database schema
35. What is the significance of
an instance in the context of database replication?
a. An instance represents the overall structure of the database
b. An instance is synonymous with a table in the database
c. An instance is a specific occurrence of a database schema at a
particular moment in time
d. An instance facilitates the creation of copies of the database for
redundancy and performance purposes
Answer: d. An instance facilitates the creation of copies of the
database for redundancy and performance purposes
36. In a DBMS, what is the
primary function of an instance-based cursor?
a. To represent the overall structure of the database
b. To store a specific record in a table
c. To create a snapshot of the database at a specific point in time
d. To navigate and process data related to a specific occurrence of the
database schema
Answer: d. To navigate and process data related to a specific occurrence
of the database schema
37. What does the term
"instance-based indexing" refer to in a DBMS?
a. Indexing based on the overall structure of the database
b. Indexing based on a specific record in a table
c. Indexing based on a specific row in a database
d. Indexing based on a specific occurrence of a database schema
Answer: c. Indexing based on a specific row in a database
38. In a DBMS, what is an example
of an instance-level operation?
a. Creating a database schema
b. Inserting a specific record into a table
c. Defining relationships between tables
d. Representing the overall structure of the database
Answer: b. Inserting a specific record into a table
39. What is the role of an
instance in the context of database concurrency control?
a. To represent the overall structure of the database
b. To store a specific record in a table
c. To create a snapshot of the database at a specific point in time
d. To ensure the consistency of transactions involving a specific
occurrence of the database schema
Answer: d. To ensure the consistency of transactions involving a
specific occurrence of the database schema
40. In a DBMS, what is an
instance identifier used for?
a. To represent the overall structure of the database
b. To store a specific record in a table
c. To create a snapshot of the database at a specific point in time
d. To uniquely identify a specific occurrence of the database schema
Answer: d. To uniquely identify a specific occurrence of the database
schema
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