Data Modeling Exam
Answer Key
Course Introduction
Data Modeling is a foundational course that introduces students to the concepts and techniques used to represent and structure data for effective storage, retrieval, and analysis within information systems. The course covers the principles of conceptual, logical, and physical data models, emphasizing the entity-relationship (ER) approach and normalization processes. Students learn to translate real-world requirements into structured frameworks, ensuring data integrity and supporting efficient database design. Through hands-on projects and case studies, students gain practical experience in designing data models using industry-standard tools and notations, preparing them for roles in database development and information system analysis.
Recommended Textbook
Modern Database Management 12th Edition by Jeffrey A. Hoffer
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14 Chapters
1469 Verified Questions
1469 Flashcards
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Chapter 1: The Database Environment and Development Process
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116 Verified Questions
116 Flashcards
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Sample Questions
Q1) Database architects establish standards for data in business units.
A)True
B)False
Answer: True
Q2) Organizational commitment to a database project is not necessary for its success.
A)True
B)False
Answer: False
Q3) With the database approach, data descriptions are stored in a central location known as a:
A) server.
B) mainframe.
C) PC.
D) repository.
Answer: D
Q4) Repositories are always used in file processing systems.
A)True
B)False
Answer: False
Page 3
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Chapter 2: Modeling Data in the Organization
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103 Verified Questions
103 Flashcards
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Sample Questions
Q1) How is a strong entity different from a weak entity?
Answer: A strong entity type exists independently of any other entities. A weak entity type depends on another (strong) entity type. When an instance of the strong entity type no longer exists, any weak entity instances which depend upon the strong entity cease to exist.
Q2) An attribute that must have a value for every entity (or relationship) instance is a(n):
A) composite attribute.
B) required attribute.
C) optional attribute.
D) multivalued attribute.
Answer: B
Q3) Which of the following is an entity that exists independently of other entity types?
A) Codependent
B) Weak
C) Strong
D) Variant
Answer: C
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4
Chapter 3: The Enhanced E-R Model
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103 Verified Questions
103 Flashcards
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Sample Questions
Q1) The subtype discriminator is a composite attribute when there is a(n):
A) overlap rule.
B) disjoint rule.
C) partial specialization.
D) full specialization.
Answer: A
Q2) Packaged data models are as flexible as possible, because all supertype/subtype relationships allow the total specialization and overlap rules.
A)True
B)False
Answer: True
Q3) When identifying the parts of the packaged data model that apply to your organization, one should first start with:
A) entities.
B) attributes.
C) primary keys.
D) relationships.
Answer: A
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Chapter 4: Logical Database Design and the Relational Model
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102 Verified Questions
102 Flashcards
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Sample Questions
Q1) ________ database specification indicates all the parameters for data storage that are then input to database implementation.
A) Logical
B) Physical
C) Schematic
D) Conceptual
Q2) Data structures include data organized in the form of tables with rows and columns.
A)True
B)False
Q3) Discuss the properties of relations.
Q4) A synonym is an attribute that may have more than one meaning.
A)True
B)False
Q5) A transversal dependency is a functional dependency between two or more nonkey attributes.
A)True
B)False
Q6) Discuss why it is important to remove multivalued attributes from a relation.
Page 6
Q7) Explain how subtype/supertype relationships are converted to relations.
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Chapter 5: Physical Database Design and Performance
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103 Flashcards
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Sample Questions
Q1) A method that speeds query processing by running a query at the same time against several partitions of a table using multiprocessors is called:
A) multiple partition queries.
B) perpendicular query processing.
C) parallel query processing.
D) query optimization.
Q2) An extent is a named portion of secondary memory allocated for the purpose of storing physical records.
A)True
B)False
Q3) Database access frequencies are estimated from:
A) transaction volumes.
B) user logins.
C) security violations.
D) random number generation.
Q4) Using an index for attributes referenced in ORDER BY and GROUP BY clauses has no significant impact upon database performance.
A)True
B)False
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Chapter 6: Introduction to SQL
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105 Verified Questions
105 Flashcards
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Sample Questions
Q1) Relational databases are heavily based on the mathematical concept of:
A) Set Theory.
B) Bet Theory.
C) Get Theory.
D) Met Theory.
Q2) A single value returned from an SQL query that includes an aggregate function is called a(n):
A) agate.
B) scalar aggregate.
C) vector aggregate.
D) summation.
Q3) What three clauses are contained in most SQL retrieval statements?
Q4) Some DBMS can handle graphic data types as well as text and numbers.
A)True
B)False
Q5) A single value returned from an SQL query that includes an aggregate function is called a vector aggregate.
A)True
B)False
Q6) What is a materialized view, and when would it be used?
Page 8
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Chapter 7: Advanced SQL
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107 Verified Questions
107 Flashcards
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Sample Questions
Q1) An SQL query that implements an outer join will return rows that do not have matching values in common columns.
A)True B)False
Q2) The following SQL statement is an example of a correlated subquery. select first_name, last_name, total_sales from salesman s1 where total_sales > all (select total_sales from salesman s2 where s1.salesman_id != s2.salesman_id);
A)True
B)False
Q3) DBA_USERS contains comments on all tables in an Oracle database. A)True B)False
Q4) What are some tips for developing queries?
Q5) What can be done with Persistent Stored Modules?
Q6) The natural join is very rarely used.
A)True
B)False
Page 9
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Chapter 8: Database Application Development
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105 Verified Questions
105 Flashcards
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Sample Questions
Q1) Java programs similar to applets that execute on the server are called hamlets.
A)True
B)False
Q2) Lack of secure standards and lack of user acceptance are the major issues that must be resolved with Web services.
A)True
B)False
Q3) When an XML document is shredded, each element is:
A) thrown away.
B) split up.
C) stored in a relational table.
D) added to other XML documents.
Q4) The main difference between Java applets and Java servlets is:
A) applets are stored on the client but executed on the server.
B) servlets are stored on the server while applets are stored on the client.
C) both applets and servlets are executed and stored on the server.
D) only applets will run on Macintosh systems.
Q5) Simple Object Access Protocol (SOAP) is an XML-Based communication protocol.
A)True
B)False
Page 10
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Chapter 9: Data Warehousing
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103 Verified Questions
103 Flashcards
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Sample Questions
Q1) A data mart is a data warehouse that contains data that can be used across the entire organization.
A)True
B)False
Q2) Which of the following factors drive the need for data warehousing?
A) Businesses need an integrated view of company information.
B) Informational data must be kept together with operational data.
C) Data warehouses generally have better security.
D) Reduce virus and Trojan horse threats.
Q3) ________ is an ill-defined term applied to databases where size strains the ability of commonly used relational DBMSs to manage the data.
A) Mean data
B) Small data
C) Star data
D) Big data
Q4) Informational systems are designed for all of the following EXCEPT:
A) running a business in real time.
B) supporting decision making.
C) complex queries.
D) data mining.
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Chapter 10: Data Quality and Integration
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105 Flashcards
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Sample Questions
Q1) Quality data does not have to be unique.
A)True
B)False
Q2) The process of transforming data from a detailed to a summary level is called selection.
A)True
B)False
Q3) ETL is short for Extract, Transform, Load.
A)True
B)False
Q4) A technique using pattern recognition to upgrade the quality of raw data is called:
A) data scrounging.
B) data scrubbing.
C) data gouging.
D) data analysis.
Q5) Discuss the ETL process.
Q6) What are some of the characteristics of quality data?
Q7) Discuss Master Data Management.
Q8) Why is data quality important?
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Chapter 11: Big Data and Analytics
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102 Verified Questions
102 Flashcards
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Sample Questions
Q1) Big data:
A) requires a normalized dataset to 3 Normal Form.
B) does not require a strictly defined data model.
C) requires a strictly defined schema.
D) requires a normalized dataset to BCNF.
Q2) ________ is arguably the most common concern by individuals regarding big data analytics.
A) Saving money
B) Taking up large amounts of computer storage
C) Personal privacy
D) Processing time
Q3) Neo4j is a wide-column NoSQL database management system developed by Oracle.
A)True
B)False
Q4) There are four main types of NoSQL database data models that include key-value stores, document stores, wide-column stores, and graph databases. Provide an example of a NoSQL database management system for each model.
Q5) Hadoop is considered a relational database management system.
A)True
B)False
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Chapter 12: Data and Database Administration
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110 Verified Questions
110 Flashcards
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Sample Questions
Q1) The data administrator takes responsibility for the overall management of data resources.
A)True
B)False
Q2) The W3C standard for Web privacy is called:
A) the Web privacy act.
B) Platform for Privacy Preferences.
C) Freedom of Web Information Act.
D) the Magna Carta.
Q3) The Information Resource Lexicon System (IRLS) is a computer software tool used to manage and control access to the information repository.
A)True
B)False
Q4) The restoration manager allows the DBMS to restore the database to a correct condition and restart processing transactions.
A)True
B)False
Q5) What factors should one consider when choosing an open source DBMS?
Q6) What is a journalizing facility?
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Chapter 13: Distributed Databases
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100 Verified Questions
100 Flashcards
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Sample Questions
Q1) A design goal for distributed databases that states that although a distributed database runs many transactions, it appears that a given transaction is the only one in the system is called:
A) linear run.
B) concurrency transparency.
C) transaction CPU transparency.
D) location transparency.
Q2) Which of the following is true about horizontal partitioning?
A) Data can be stored to optimize local access.
B) Data are less secure.
C) There is consistent access speed.
D) It only works with Macintosh systems.
Q3) All of the following are advantages of vertical partitioning EXCEPT: A) efficiency.
B) security.
C) ease of querying.
D) easier to set up than horizontal partitioning.
Q4) A replicated database with snapshots is very manageable.
A)True
B)False
Page 15
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Chapter 14: Object-Oriented Data Modeling
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105 Verified Questions
105 Flashcards
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Sample Questions
Q1) {disjoint, complete} is an example of a UML:
A) expansion.
B) HTML link.
C) business rule constraint.
D) database clause.
Q2) A state represents how an object acts.
A)True
B)False
Q3) Which of the following is a reason for using an object-oriented design?
A) The analysis model is not formal enough to be implemented in a programming language.
B) The actual system is not adapted to the environment in which the system will actually be implemented.
C) Documentation is provided.
D) Traditional ERD is preferred.
Q4) According to the UML Notation Guide, the term disjoint means that a descendent may not be descended from more than one of the subclasses.
A)True
B)False
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