Deck 2: Database Management System DBMS: Part B

Question 1

Which of the following is the operation that is used if we are interested in only certain attributes or columns of a table?

A)SELECT
B)PROJECT
C)UNION
D)JOIN

Answer 1

PROJECT

Question 2

Which of the following is not a procedural language?

A)Relational Algebra
B)SQL
C)Relational calculus
D)None of the above

Answer 2

Relational calculus

Question 3

Who developed QBE?

A)C.J. Date
B)E.F. Codd
C)M.M. Zloof
D)None of the above

Answer 3

M.M. Zloof

Question 4

What is the expansion of QBE?

A)Query by Example
B)Query by Experiment
C)Question before evaluation
D)None of the above

Question 5

Who developed Structured English Query Language?

A)E.F. Codd
B)D. Chamberlain
C)Chris Date
D)None of the above

Question 6

Which of the following is IBM's first RDBMS?

A)DB2
B)IMS
C)SQL/DS
D)None of the above

Question 7

The DBMS processes queries in three phases; the first is ____.

A)parsing
B)analyzing
C)execution
D)fetching

Question 8

Generally, what will provide the best database client performance in terms of CPU speed?

A)single processor
B)multiple processors
C)the slowest processor
D)the fastest processor

Question 9

Working with data in the data cache is many times faster than working with data in the data files because ____.

A)there is no network access involved
B)the DBMS doesn't have to wait for the hard disk to retrieve the data
C)the DBMS can optimize queries against the cache
D)the data cache contains only a few records from each table

Question 10

When creating a database, in order to optimize performance, put high-usage tables in their own ____.

A)data caches
B)data spaces
C)table caches
D)table spaces

Question 11

Database statistics are stored in the system catalog in specially designated ____.

A)indexes
B)rows
C)table spaces
D)Tables

Question 12

To optimize queries, use simple columns or literals as operands in a conditional expression and avoid the use of conditional expressions with ____ whenever possible.

A)the WHERE clause
B)functions
C)the GROUP BY clause
D)Indexes

Question 13

The architecture of a DBMS is represented by the ____ and structures used to manage a database.

A)tables
B)queries
C)processes
D)Logs

Question 14

The majority of current database performance problems are related to ____.

A)not having enough memory on the database server
B)poorly written SQL code
C)improper use of table space
D)old statistics

Question 15

Which type of entity represents a logical generalization whose actual occurrence is represented by a second, associated entity?

A)Supertype entity
B)Subtype entity
C)Archetype entity
D)Instance entity

Question 16

Which of the following is the preferred way to recover a database after a transaction in progress terminates abnormally?

A)Rollback
B)Rollforward
C)Switch to duplicate database
D)Reprocess transactions

Question 17

Concurrency control is important for which of the following reasons?

A)To ensure data integrity when updates occur to the database in a multiuser environment
B)To ensure data integrity when updates occur to the database in a single-user environment
C)To ensure data integrity while reading data occurs to the database in a multiuser environment
D)To ensure data integrity while reading data occurs to the database in a single-user environment

Question 18

The transaction log includes which of the following?

A)The before-image of a record
B)The after-image of a record
C)The before and after-image of a record
D)The essential data of the record

Question 19

Which of the following is not true of SQL views?

A)Oracle views cannot use the ORDER BY clause in view definitions.
B)Oracle views are created using the standard SQL-92 CREATE VIEW command.
C)Oracle views can by queri