Data Warehousing Mock
Exam
Course Introduction
Data Warehousing explores the fundamental concepts, architectures, and techniques involved in building and managing data warehouses, which are central repositories for integrated data from multiple sources. The course covers topics such as data modeling, ETL (Extract, Transform, Load) processes, star and snowflake schema design, OLAP (Online Analytical Processing), and data warehouse optimization. Students will learn how to design, implement, and maintain data warehouses to support business intelligence, reporting, and decision-making. Practical exercises may include building a data warehouse and using industry-standard tools for querying and analysis.
Recommended Textbook
Database Systems Introduction to Databases and Data Warehouses 1st Edition by Nenad Jukic
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10 Chapters
752 Verified Questions
752 Flashcards
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2
Chapter 1: Introduction
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57 Verified Questions
57 Flashcards
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Sample Questions
Q1) Database administration encompasses the tasks related to the maintenance and supervision of a database system.
A)True
B)False
Answer: True
Q2) DBMS is software used for the following purpose:
A)Creation of databases
B)Insertion,storage,retrieval,update,and deletion of the data in the database
C)Maintenance of databases
D)All of the above
Answer: D
Q3) What is a database system?
Answer: A database system is a computer-based system,and its purpose is to enable an efficient interaction between the users and the information captured in a database.
Q4) The term operational information refers to the information collected and used in support of day-to-day operational needs.
A)True
B)False Answer: True
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Chapter 2: Database Requirements and ER Modeling
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100 Verified Questions
100 Flashcards
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Sample Questions
Q1) Components of a unique composite attribute are not unique.
A)True
B)False
Answer: True
Q2) Maximum cardinality can be:
A)One or many
B)Zero or many
C)Optional or mandatory
D)Optional or many
Answer: A
Q3) According to the Eaglerun Trucking Dispatcher ER diagram,each driver has a unique DriverName value.
A)True
B)False
Answer: False
Q4) ER modeling is a widely used logical database modeling method.
A)True
B)False
Answer: False
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Chapter 3: Relational Database Modeling
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100 Verified Questions
100 Flashcards
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Sample Questions
Q1) An optional attribute of an entity is not mapped as a column of a relation.
A)True
B)False
Answer: False
Q2) If a 1:M relationship is optional on both sides,and if the table resulting from the 1 side has 3 records,then the table resulting from the M side CANNOT have less than ________ records.
A)0
B)1
C)2
D)3
Answer: A
Q3) As a result of mapping the ZYX Company ERD into a relational schema,primary key of the relation CUSTOMER will be referred to by a foreign key in the relation CUSTOMER.
A)True
B)False
Answer: True
Q4) Give a definition of entity integrity constraint. Answer: In a relational table,no primary key column can have null (empty)values.
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Chapter 4: Update Operations, update Anomalies, and Normalization
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100 Verified Questions
100 Flashcards
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Sample Questions
Q1) If A,B,C,and D are columns of the table whose composite primary key is A,B while C and D are nonkey columns then C --> D is a transitive functional dependency.
A)True
B)False
Q2) Every relation is in 1NF.
A)True
B)False
Q3) Functional dependency OwnerName --> VehicleID exists in the table VEHICLE.
A)True
B)False
Q4) Functional dependency Make --> OwnerName exists in the table VEHICLE. A)True B)False
Q5) Table STUDENT is in 3NF. A)True B)False
Q6) Every relation without partial functional dependencies is in 2NF. A)True B)False Page 6
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Page 7
Chapter 5: SQL
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100 Verified Questions
100 Flashcards
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Sample Questions
Q1) What is the purpose of the CREATE TABLE command?
Q2) In which case will the result of the statement in the following form COUNT(column_name)FROM table not be equal to the number of records in the table?
Q3) List the SQL set operators.
Q4) What is the purpose of the LIKE keyword?
Q5) The following query on table VEHICLE will return two numbers: SELECT COUNT(*)from vehicle GROUP BY ownername; A)True B)False
Q6) What is a nested query?
Q7) DCL commands are used to manage database transactions. A)True B)False
Q8) TCL commands facilitate the process of data access control. A)True B)False
Page 8
Q9) Write an SQL query for the HAPPY INSURANCE database that will list the agent ID and agent name for each agent hired before the year 2000.
Q10) What is a self-JOIN?
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Page 9
Chapter 6: Database Implementation and Use
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Sample Questions
Q1) Which of the following describes the conformity data quality characteristic?
A)The degree to which all the required data is present in the data collection
B)The extent to which the data properly conforms to and matches up with the other data
C)The extent to which data correctly reflects the real world instances it is supposed to depict
D)The extent to which the data conforms to its specified format
Q2) What are corrective data quality actions?
Q3) Describe the update set-to-null option (for implementing a referential integrity constraint).
Q4) If a DBMS enforces in the HAPPY INSURANCE database a DELETE RESTRICT option on the referential integrity constraint between AGENT and AGENT (i.e. ,circular referential integrity constraint for table AGENT)in the HAPPY INSURANCE database,and a DELETE CASCADE between AGENT and CLIENT,the first record in the table AGENT can be deleted.
A)True
B)False
Q5) What is a report?
Q6) Describe the delete set-to-default option (for implementing a referential integrity constraint).
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Chapter 7: Data Warehousing Concepts
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48 Verified Questions
48 Flashcards
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Sample Questions
Q1) Implicit changes of data warehouse requirements are permitted during:
A)Data warehouse use
B)Data warehouse deployment
C)Creating ETL infrastructure
D)Implicit changes of requirements are not permitted
Q2) Data warehouse requirements can be refined and/or expanded following:
A)Data warehouse use
B)Data warehouse deployment
C)Creating ETL infrastructure
D)All of the above
Q3) It is always possible to structure a database that can be used in a straightforward manner for both operational and analytical purposes.
A)True
B)False
Q4) Data warehouse front-end applications are often referred to as business intelligence (BI)applications.
A)True
B)False
Q5) What is a dependent data mart?
Q6) List the three major components of every data warehousing system.
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Chapter 8: Data Warehouse and Data Mart Modeling
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Sample Questions
Q1) The value 250lb from the STATEWIDE HEALTH PRESCRIPTIONS database appears all together ________ time(s)in the populated tables of the STATEWIDE HEALTH star schema.
A)1
B)2
C)3
D)5
Q2) The CUSTOM SPA DAILY VISITS DATABASE column VisitID provides the data for a dimension in the STATEWIDE HEALTH star schema.
A)True
B)False
Q3) The value 10 from the STATEWIDE HEALTH PRESCRIPTIONS database appears all together ________ time(s)in the populated tables of the STATEWIDE HEALTH star schema.
A)0
B)1
C)2
D)3
Q4) What is the difference between detailed fact tables and aggregated fact tables?
Q5) What type of columns does a dimension table contain?
Page 12
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Chapter 9: Data Warehouse Implementation and Use
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Sample Questions
Q1) The data in fact tables is always located faster in relational implementations than in the multidimensional implementations.
A)True
B)False
Q2) OLAP/BI tools can be used for:
A)Ad-hoc direct analysis only
B)Creation of front-end (BI)applications only
C)Ad-hoc direct analysis and creation of front-end (BI)applications
D)Neither ad-hoc direct analysis nor creation of front-end (BI)applications
Q3) Creating a data warehouse involves using the functionalities of database management software to implement the data warehouse model as a collection of physically created and mutually connected database tables.
A)True
B)False
Q4) What takes place during the extraction part of ETL?
Q5) What is a refresh load?
Q6) The multidimensional database cube always has three dimensions.
A)True
B)False
Page 13
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Chapter 10: Overview of Dbms Functionalities and Database Administration
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42 Verified Questions
42 Flashcards
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Sample Questions
Q1) What is a query optimizer?
Q2) The TCL commands are used by the business end users of a database system. A)True B)False
Q3) What is update failure?
Q4) The application development component is a part of every DBMS package. A)True B)False
Q5) How many records will the following query in the HAPPY INSURANCE database return? SELECT DISTINCT table_name FROM user_tab_columns; A)2 B)3 C)10 D)13
Q6) The data manipulation component is a part of every DBMS package. A)True B)False
14
Q7) What is a query hint?
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