Database Systems
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Course Introduction
Database Systems introduces students to the fundamental concepts and principles of designing, implementing, and managing databases. The course covers data models with a primary focus on the relational model, database architecture, query languages such as SQL, normalization, and indexing for efficient data retrieval. Students will gain practical experience in database design, creation, and application development, as well as an understanding of transaction management, concurrency control, and database security. By the end of the course, students will be equipped with essential skills to develop and maintain robust database systems for a wide range of real-world applications.
Recommended Textbook
Database Systems Design Implementation and Management 11th Edition by Carlos Coronel
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15 Chapters
1318 Verified Questions
1318 Flashcards
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Chapter 1: Database Systems
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Sample Questions
Q1) is defined as the condition in which all of the data in the database are consistent with the real-world events and conditions.
A) Data integrity
B) Data anomaly
C) Data ubiquity
D) Data quality
Answer: A
Q2) An advantage of database systems is that you needn't perform frequent updates and apply latest patches.
A)True
B)False
Answer: False
Q3) data exist in a format that does not lend itself to processing that yields information.
A) Structured
B) Semistructured
C) Unstructured
D) Historical
Answer: C
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3
Chapter 2: Data Models
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Q1) In an SQL-based relational database, each table is dependent on every other table.
A)True
B)False
Answer: False
Q2) In object-oriented terms, a(n) defines an object's behavior.
Answer: method
Q3) A data model is usually graphical.
A)True
B)False
Answer: True
Q4) Oracle 11g is an example of the .
A) hierarchical model
B) file system data model
C) relational data model
D) XML/Hybrid data model
Answer: D
Q5) Each column in a relation represents a(n) .
Answer: attribute
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Chapter 3: The Relational Database Model
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Sample Questions
Q1) Dr. Codd's rule of relational database states that every value in a table is guaranteed to be accessible through a combination of table name, primary key value, and column name.
Answer: Guaranteed Access
Q2) In a relational table, each column has a specific range of values known as the domain.
Answer: attribute
Q3) If one department chair-a professor-can chair only one department, and one department can have only one department chair. The entities PROFESSOR and DEPARTMENT exhibit a(n) relationship.
Answer: 1:1
Q4) You can think of a table as a persistent representation of a logical relation. A)True B)False
Answer: True
Q5) A(n) index is an index in which the index key can have only one pointer value (row) associated with it.
Answer: unique
Q6) The proper use of keys is crucial to controlling data redundancy.
Answer: foreign
Page 5
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Chapter 4: Entity Relationship Er Modeling
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Sample Questions
Q1) Referential integrity and participation are both bidirectional, meaning that they must be addressed in both directions along a relationship.
A)True
B)False
Q2) In Chen notation, there is no way to represent cardinality.
A)True
B)False
Q3) A attribute can be further subdivided to yield additional attributes.
A) composite
B) simple
C) single-valued
D) multivalued
Q4) A(n) process is based on repetition of processes and procedures.
Q5) When indicating cardinality, the first value represents the number of associated entities.
Q6) not only helps database designers to stay on track during the design process, it also enables them to pick up the design thread when the time comes to modify the design.
Q7) The Chen notation identifies a weak entity by using a double-walled entity .
Q8) A person's Social Security number would be an example of a(n) attribute.
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Chapter 5: Advanced Data Modeling
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Sample Questions
Q1) An entity cluster is considered "virtual" or " " in the sense that it is not actually an entity in the final ERD.
Q2) If one exists, a data modeler uses a as the primary key of the entity being modeled.
A) foreign key
B) combination key
C) surrogate key
D) natural identifier
Q3) Composite primary keys are particularly useful as identifiers of composite entities, where each primary key combination is allowed in the M:N relationship.
Q4) A specialization hierarchy can have level(s) of supertype/subtype relationships.
A) zero
B) only one
C) one or many
D) many
Q5) Generalization is based on grouping unique characteristics and relationships of the subtypes.
A)True
B)False
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Chapter 6: Normalization of Database Tables
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Sample Questions
Q1) In order to meet performance requirements, portions of the database design may need to be occasionally denormalized.
A)True
B)False
Q2) If database tables are treated as though they were files in a file system, the never has a chance to demonstrate its superior data-handling capabilities.
Q3) Converting a database format from 1NF to 2NF is a complex process.
A)True
B)False
Q4) The conflicts between design efficiency, information requirements, and performance are often resolved through_____.
A) compromises that include normalization
B) conversion from 2NF to 3NF
C) compromises that include denormalization
D) conversion from 3NF to 4NF
Q5) According to the data-modeling checklist, should be nouns that are familiar to business, should be short and meaningful, and should document abbreviations, synonyms, and aliases for each entity.
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Chapter 7: Introduction to Structured Query Language Sql
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Sample Questions
Q1) A(n) is a logical group of database objects, such as tables and indexes, that are related to each other.
Q2) Which of the following queries will output the table contents when the value of P_PRICE is less than or equal to 10?
A) SELECT P_DESCRIPT, P_INDATE, P_PRICE, V_CODE FROM PRODUCT WHERE P_PRICE <> 10;
B) SELECT P_DESCRIPT, P_INDATE, P_PRICE, V_CODE FROM PRODUCT WHERE P_PRICE <= 10;
C) SELECT P_DESCRIPT, P_INDATE, P_PRICE, V_CODE FROM PRODUCT WHERE P_PRICE => 10; D) SELECT P_DESCRIPT, P_INDATE, P_PRICE, V_CODE FROM PRODUCT WHERE P_PRICE = 10;
Q3) Oracle users can use the Access QBE (query by example) query generator.
A)True
B)False
Q4) A(n) , also known as a nested query or an inner query, is a query that is embedded (or nested) inside another query.
Q5) Date procedures are often more software-specific than other SQL procedures. A)True B)False
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Chapter 8: Advanced Sql
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Sample Questions
Q1) How many rows would be returned from a cross join of tables A and B, if A contains 8 rows and B contains 18?
A) 8
B) 18
C) 26
D) 144
Q2) To test a trigger, one should use the EXECUTE TRIGGER command.
A)True
B)False
Q3) The syntax of the MINUS statement in Oracle is .
Q4) In Oracle, the function converts a date to a character string.
A) CONVERT()
B) TO_DATE
C) TO_CHAR()
D) TO_STRING()
Q5) In MS Access, a designer can use the data type to define a column in his table that will be automatically populated with unique numeric values.
Q6) Oracle uses the function to extract the various parts of a date.
Q7) How are triggers critical to proper database operation and management?
Page 10
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Chapter 9: Database Design
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Sample Questions
Q1) Database performance is one of the least important factors in all database implementations.
A)True
B)False
Q2) The system's defines the extent of the design according to operational requirements.
Q3) The initial assessment and the feasibility study are part of the Systems Development Life Cycle's (SDLC's) ? phase.
A) planning
B) analysis
C) detailed systems design
D) implementation
Q4) "Should the existing system be replaced?" is a question that is asked during the stage of the Systems Development Life Cycle (SDLC).
A) planning
B) analysis
C) implementation
D) maintenance
Q5) allows the assignment of access rights to specific authorized users.
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Chapter 10: Transaction Management and Concurrency Control
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Sample Questions
Q1) A consistent database state is .
A) one in which all tables have foreign keys
B) one in which all data integrity constraints are satisfied
C) one in which all tables are normalized
D) one in which all SQL statements only update one table at a time
Q2) means that data used during the execution of a transaction cannot be used by a second transaction until the first one is completed.
A) Serializability
B) Atomicity
C) Isolation
D) Time stamping
Q3) A growing phase in a two-phase lock is when a transaction acquires all the required locks without locking any data.
A)True
B)False
Q4) A field-level lock allows concurrent transactions to access the same row, as long as they require the use of different fields within that row.
A)True
B)False
12
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Chapter 11: Database Performance Tuning and Query
Optimization
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Sample Questions
Q1) Maximizing disk contention is one of the general recommendations for the physical storage of databases.
A)True
B)False
Q2) Using index characteristics, a database designer can determine the best type of index to use.
A)True
B)False
Q3) A(n) request is a low-level read or write data access operation to or from computer devices.
Q4) Knowing the sparsity of a column helps you decide whether the use of is appropriate.
A) query processing
B) query optimization
C) an index
D) a full table scan
Q5) DBMS query processing has phases.
Q6) List and describe some typical DBMS processes.
Page 13
Q7) A conditional expression is normally expressed within the or HAVING clauses of a SQL statement.
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Chapter 12: Distributed Database Management Systems
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Sample Questions
Q1) Describe performance transparency and heterogeneity transparency.
Q2) In a distributed database management system (DDBMS), query is used to find the best access strategy.
Q3) _____ distributed database management system (DDBMS) integrate multiple instances of the same DBMS over a network.
A) Homogeneous
B) Heterogeneous
C) Fully heterogeneous
D) Combination
Q4) Performance transparency ensures that the system finds the most cost-effective path to access remote data.
A)True
B)False
Q5) Distributed processing does not require a distributed database, and a distributed database does not require distributed processing.
A)True
B)False
Q6) Explain the three types of operations defined by the DO-UNDO-REDO protocol.
Q7) The distributed database system must be of the computer hardware system.
Page 15
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Chapter 13: Business Intelligence and Data Warehouses
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Sample Questions
Q1) Describe the use of SQL in relation to ROLAP.
Q2) What is the difference between decision support data and operational data from the point of view of data analyst?
Q3) _____ use web-based technologies to present key business performance indicators or information in a single integrated view, generally using graphics in a clear, concise, and easy to understand manner.
Q4) The most distinctive characteristic of modern OLAP tools is their capacity for _____ analysis.
Q5) _____ are numeric measurements (values) that represent a specific business aspect or activity.
Q6) _____ splits a table into subsets of rows or columns and places the subsets close to the client computer to improve data access time.
A) Normalization
B) Meta modeling
C) Replication
D) Partitioning
Q7) The hierarchy provides the capability to perform drill-down and roll-up searches in a data warehouse.
16
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Chapter 14: Database Connectivity and Web Technologies
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Sample Questions
Q1) Cloud services allow any organization to quickly and economically add information technology services to its IT portfolio.
A)True
B)False
Q2) What is a server-side extension? Explain.
Q3) A web server is a middleware application that expands the functionality of web servers by linking them to a wide range of services.
Q4) In the ADO.NET framework, the object contains the actual SQL code or a stored procedure call to be run by the database.
A) Command
B) DataReader
C) DataAdapter
D) DataSet
Q5) The web browser's job is to interpret the HTML code that it receives from a web server and to:
A) develop web-based applications.
B) display it in a standard formatted way.
C) perform immediate data entry validation.
D) extract details, such as order data, from it.
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Chapter 15: Database Administration and Security
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Sample Questions
Q1) The component of a CASE tool produces the information system's input/output formats.
A) analysis
B) graphics
C) program document generator
D) screen painter and report generator
Q2) User-access management is a subset of .
A) password protection
B) authorization management
C) data integrity management
D) managerial control
Q3) The DBA or security officer must secure an insurance policy to provide financial protection in the event of a database failure.
A)True
B)False
Q4) Training people to use the DBMS and its tools is not included in the responsibilities of a DBA.
A)True
B)False
Q5) A(n) _____ physically stores the database's data.
Page 18
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