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Free download in PDF Data warehouse Objective Type Questions(MCQs) & Answers. These Objective Type questions on Computer Science are very useful for NIELIT, BCA, B.Sc. MCA, M.Sc. B.Tech, M.Tech, BE, ME students an interview for various positions like Web Developer, System Analyst etc.
(1)
Data scrubbing is which of the following?
[A]
A process to reject data from the data warehouse and to create the necessary indexes
[B]
A process to load the data in the data warehouse and to create the necessary indexes
[C]
A process to upgrade the quality of data after it is moved into a data warehouse
[D]
A process to upgrade the quality of data before it is moved into a data warehouse
Answer: A process to upgrade the quality of data before it is moved into a data warehouse
(2)
The @active data warehouse architecture includes which of the following?
[A]
At least one data mart
[B]
Data that can extracted from numerous internal and external sources
[C]
Near real-time updates
[D]
All of the above
(3)
A goal of data mining includes which of the following?
[A]
To explain some observed event or condition
[B]
To confirm that data exists
[C]
To analyze data for expected relationships
[D]
To create a new data warehouse
Answer: To explain some observed event or condition
(4)
An operational system is which of the following?
[A]
A system that is used to run the business in real time and is based on historical data.
[B]
A system that is used to run the business in real time and is based on current data.
[C]
A system that is used to support decision making and is based on current data.
[D]
A system that is used to support decision making and is based on historical data.
Answer: A system that is used to run the business in real time and is based on current data.
(5)
A data warehouse is which of the following?
[A]
Can be updated by end users.
[B]
Contains numerous naming conventions and formats.
[C]
Organized around important subject areas.
[D]
Contains only current data.
Answer: Organized around important subject areas.
(6)
Data scrubbing is which of the following?
[A]
A process to reject data from the data warehouse and to create the necessary indexes
[B]
A process to load the data in the data warehouse and to create the necessary indexes
[C]
A process to upgrade the quality of data after it is moved into a data warehouse
[D]
A process to upgrade the quality of data before it is moved into a data warehouse
Answer: A process to upgrade the quality of data before it is moved into a data warehouse
(7)
The @active data warehouse architecture includes which of the following?
[A]
At least one data mart
[B]
Data that can extracted from numerous internal and external sources
[C]
Near real-time updates
[D]
All of the above.
Answer: All of the above.
(8)
A goal of data mining includes which of the following?
[A]
To explain some observed event or condition
[B]
To confirm that data exists
[C]
To analyze data for expected relationships
[D]
To create a new data warehouse
Answer: To explain some observed event or condition
(9)
An operational system is which of the following?
[A]
A system that is used to run the business in real time and is based on historical data.
[B]
A system that is used to run the business in real time and is based on current data.
[C]
A system that is used to support decision making and is based on current data.
[D]
A system that is used to support decision making and is based on historical data.
Answer: A system that is used to run the business in real time and is based on current data.
(10)
A data warehouse is which of the following?
[A]
Can be updated by end users.
[B]
Contains numerous naming conventions and formats.
[C]
Organized around important subject areas.
[D]
Contains only current data.
Answer: Organized around important subject areas.
(11)
A snowflake schema is which of the following types of tables?
[A]
Fact
[B]
Dimension
[C]
Helper
[D]
All of the above
(12)
The generic two-level data warehouse architecture includes which of the following?
[A]
At least one data mart
[B]
Data that can extracted from numerous internal and external sources
[C]
Near real-time updates
[D]
All of the above.
Answer: Data that can extracted from numerous internal and external sources
(13)
Fact tables are which of the following?
[A]
Completely denoralized
[B]
Partially denoralized
[C]
Completely normalized
[D]
Partially normalized
Answer: Completely normalized
(14)
Data transformation includes which of the following?
[A]
A process to change data from a detailed level to a summary level
[B]
A process to change data from a summary level to a detailed level
[C]
Joining data from one source into various sources of data
[D]
Separating data from one source into various sources of data
Answer: A process to change data from a detailed level to a summary level
(15)
Reconciled data is which of the following?
[A]
Data stored in the various operational systems throughout the organization.
[B]
Current data intended to be the single source for all decision support systems.
[C]
Data stored in one operational system in the organization.
[D]
Data that has been selected and formatted for end-user support applications.
Answer: Current data intended to be the single source for all decision support systems.
(16)
The load and index is which of the following?
[A]
A process to reject data from the data warehouse and to create the necessary indexes
[B]
A process to load the data in the data warehouse and to create the necessary indexes
[C]
A process to upgrade the quality of data after it is moved into a data warehouse
[D]
A process to upgrade the quality of data before it is moved into a data warehouse
Answer: A process to load the data in the data warehouse and to create the necessary indexes
(17)
The extract process is which of the following?
[A]
Capturing all of the data contained in various operational systems
[B]
Capturing a subset of the data contained in various operational systems
[C]
Capturing all of the data contained in various decision support systems
[D]
Capturing a subset of the data contained in various decision support
Answer: Capturing a subset of the data contained in various operational systems
(18)
A star schema has what type of relationship between a dimension and fact table?
[A]
Many-to-many
[B]
One-to-one
[C]
One-to-many
[D]
All of the above.
(19)
Transient data is which of the following?
[A]
Data in which changes to existing records cause the previous version of the records to be eliminated
[B]
Data in which changes to existing records do not cause the previous version of the records to be eliminated
[C]
Data that are never altered or deleted once they have been added
[D]
Data that are never deleted once they have been added
Answer: Data in which changes to existing records cause the previous version of the records to be eliminated
(20)
A multifield transformation does which of the following?
[A]
Converts data from one field into multiple fields
[B]
Converts data from multiple fields into one field
[C]
Converts data from multiple fields into multiple fields
[D]
All of the above
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