Spring 2010-11
SCHOOLOF COMPUTING AND TECHNOLOGY
DEPARTMENT OF INFORMATION TECHNOLOGY
ITEC423 Data Warehousing
Quiz 2
Student Id: ................................................ Name : ..............................................................
Section I Match the columns (write the matching statements’ letter in front of the number).
x
1
subject-oriented,
D
A Subset of a data warehouse
2
Integrated
G
B contains slices of data across different periods of time.
3
time-variant
B
C Build departmental data mart sone by one based on priority
4
nonvolatile
H
D Warehouse is organized around major subjects
5
Data Granularity
E
E Level of detail stored in the data warehouse
6
Data Mart
A
F Data catalog of data warehouse
7
Top Down Approach G Put together corporate level application data from different source systems
J
8
Bottom Up Approach H New data always added as a supplement to the database, not as replacement
C
9
Operational Systems
I
I
Optimized for storing data via transactions
10 Metadata component
F
J
Build a central data warehouse with centralized rules and repository
Section II Choose the answer that best answer for each of the folllowing questions.
1- Which of the following data warehousing architecture takes into account the enterprise-level information requirements
a) Hub and Spoke
b) Independent Data Mart
c) Data Mart Bus
d) Centralized
e) Federated
2- For which of the following data warehousing architectures is the statement “Different data marts may have
inconsistent data definitions and standards” valid?
a) Hub and Spoke
b) Independent Data Mart
c) Data Mart Bus
d) Centralized
e) Federated
3- Which of the following data warehousing architectures result from use of assortments of existing DSSs of different types?
a) Hub and Spoke
b) Independent Data Mart
c) Data Mart Bus
d) Centralized
e) Federated
4- In which of the following data warehousing architecture conformed dimensions are used integrating supermarts hat
provides an enterprise view of the data
a) Hub and Spoke
b) Independent Data Mart
c) Data Mart Bus
d) Centralized
e) Federated
5- In which of the following data warehousing architectures does a central data warehouse supply data to data marts:
a) Hub and Spoke
b) Independent Data Mart
c) Data Mart Bus
d) Centralized
e) Federated
6-Source data is composed of
a) Production data
b) Internal Data
c) External data
d) Archived data
e) All of the above
7- ............. comes from various OLTP systems used in an enterprise.
a) Production data
b) Internal Data
c) External data
d) Archived data
e) All of the above
8-An excel file used by a department or ndividual in a department is a type of
a) Production data
b) Internal Data
c) External data
d) Archived data
e) All of the above
9-Which of the following is used to understand industry trends and compare performance of a company with its
competitors?
a) Production data
b) Internal Data
c) External data
d) Archived data
e) All of the above
10- Which of the following is not perfromed at Data Transformation stage
a) Correct spelling mistakes
b) Choose primary key
c) Delete unnecessary data
d) Update the OLTP system to transform the data into the same format
e) Choose a consistent data type and length for the data
11- Which of the following is NOT an advantage of bottom up approach when compared to top down approach
a) Allows project team to learn and grow
b) Does not need high level cross functional skills
c) Faster and easier implementation of manageable pieces
d) Less risk of failure
e) Single central storage of highly consistent data
12- Which of the following is NOT a disadvantage of top down approach when compared to bottom up approach
a) Needs high level of cross-functional skills
b) High expenditure before the product is finished
c) Allows inconsistencies in data
d) Takes longer to build even
e) High exposure to risk of failure
13- Which of the following is correct about an operational system?
a) A system that is used to support decision making and is based on current data.
b) A system that is used to support decision making and is based on historical data.
c) A system that contains historical and current data and is optimized for complex queries.
d) A system that is used to run the business in real time and is based on historical data.
e) A system that is used to run the business in real time and is based on current data.
14- What does the statement "A Data Warehouse database is non-volatile" mean?
a) Data Warehouse database structures change very infrequently.
b) Data within the data warehouse do not change from second to second.
c) Data Warehouse databases support the creation of a set of reports.
d) Data Warehouse databases contain only historical transaction data.
e) Business requirements for a Data Warehouse are stable.
15- What does the statement "A Data Warehouse database is time variant" mean?
a) Data within the data warehouse do not change from second to second.
b) Data from previous years are not stored in the data warehouse database..
c) Users of a data warehouse may view only past data
d) Data Warehouse databases contain historical data.
e) Time is not associated with any data warehouse data.