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Chapter 10
10.1
Overview of DBMS Functionalities and Database Administration
Multiple Choice Questions
1) The data manipulation DBMS component is used:
A) By end users, directly only
B) By end users, via front-end applications only
C) By end users, either directly or via front-end applications
D) By no end users
Answer: C
Diff: 1
Page Ref: 302
2) The application development component provides functionalities to the developers of:
A) Database models
B) Security and backup procedures
C) Data dictionaries
D) Front-end applications
Answer: D
Diff: 2
Page Ref: 302
3) Which of the following is NOT a data administration task?
A) Monitoring and maintaining the database system
B) Securing the database against unauthorized access
C) Creating a conceptual database model
D) Providing database backup and recovery
Answer: C
Diff: 2
Page Ref: 302
4) If, during the use of the database system, it becomes apparent that a new relation needs to be added to
the database, the decision to add the new relation to the database will rest with the:
A) Database developer
B) DBA
C) End user
D) DBMS software developer
Answer: A
Diff: 3
Page Ref: 303
5) The data dictionary created by the ________ is often referred to as the catalog.
A) TCL
B) DML
C) DCL
D) DBMS
Answer: D
Diff: 2
Page Ref: 303
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HAPPY INSURANCE
Observe the HAPPY INSURANCE DATABASE:
CLIENT
ClientID
C111
C222
C333
C444
C555
C666
C777
ClientName
Tom
Karin
Cole
Dorothy
Andy
Tina
Christina
AGENT
AgentID
A1
A2
A3
A4
AgentName
Kate
Amy
Luke
James
AREA
AreaID
1
2
3
AreaName
East
West
Central
ClientAgent
A1
A1
A2
A2
A3
A3
A4
AgentArea
1
2
3
3
ClientSpouseName
Jenny
Bill
Amy
Amy
Matt
Mike
AgentRating
101
92
100
90
AgentYearOfHire SupervisedBy
1990
2009
A1
1992
2010
A3
AreaHQ
Boston
San Francisco
Chicago
This database will be used for the following questions citing tables from the HAPPY INSURANCE
database.
6) How many records will the following query in the HAPPY INSURANCE database return?
SELECT table_name, column_name
FROM user_tab_columns;
A) 2
B) 3
C) 10
D) 13
Answer:
Diff: 2
D
Page Ref: 304
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7) 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
Answer:
Diff: 2
B
Page Ref: 304
8) What number will the following query in the HAPPY INSURANCE database return?
SELECT count (DISTINCT column_name)
FROM user_tab_columns;
A) 2
B) 3
C) 10
D) 13
Answer:
Diff: 3
D
Page Ref: 304
9) What will be the outcome of the following SQL statements issued in the HAPPY INSURANCE
database?
GRANT SELECT, INSERT, ALTER, UPDATE ON client TO shannon;
REVOKE INSERT ON client FROM shannon;
A) Shannon can read data from CLIENT, change data in CLIENT, change the metadata of CLIENT, insert
data in CLIENT
B) Shannon can read data from CLIENT, change data in CLIENT, insert data in CLIENT
C) Shannon can read data from CLIENT, change data in CLIENT, change the metadata of CLIENT
D) Shannon can insert data in CLIENT
Answer: C
Diff: 2
Page Ref: 305
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10) What will be the outcome of the following SQL statements issued in the HAPPY INSURANCE
database?
CREATE ROLE supervisor;
GRANT SELECT, INSERT, UPDATE ON client TO supervisor;
GRANT SUPERVISOR TO shannon;
A) Shannon can read data from CLIENT, change data in CLIENT, change the metadata of CLIENT, insert
data in CLIENT
B) Shannon can read data from CLIENT, change data in CLIENT, insert data in CLIENT
C) Shannon can read data from CLIENT, change data in CLIENT, change the metadata of CLIENT
D) Shannon can change the metadata of CLIENT
Answer: B
Diff: 2
Page Ref: 306
10.2
True/False Questions
1) The data definition DBMS component uses the SQL commands from the DDL category.
Answer: TRUE
Diff: 1
Page Ref: 301
2) The data definition component is a part of every DBMS package.
Answer: TRUE
Diff: 1
Page Ref: 301-302
3) The data manipulation component is a part of every DBMS package.
Answer: TRUE
Diff: 1
Page Ref: 301-302
4) The application development component is a part of every DBMS package.
Answer: FALSE
Diff: 1
Page Ref: 301-302
5) The data manipulation DBMS component uses the SQL commands from the DCL category.
Answer: FALSE
Diff: 1
Page Ref: 302
6) The DCL commands are used by the business end users of a database system.
Answer: FALSE
Diff: 1
Page Ref: 302
7) The TCL commands are used by the business end users of a database system.
Answer: FALSE
Diff: 1
Page Ref: 302
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8) Regular monitoring helps the DBA recognize instances when maintenance activities are needed.
Answer: TRUE
Diff: 1
Page Ref: 302
9) In a role-based access control system, the membership of users in roles cannot change.
Answer: FALSE
Diff: 2
Page Ref: 306
10) In a role-based access control system, users can be assigned several database roles.
Answer: TRUE
Diff: 2
Page Ref: 306
10.3
Essay Questions
1) What is the purpose of the data definition component of a DBMS?
Answer: The data definition component is used by database designers to create the infrastructure
components of the database, such as database tables and referential integrity constraints connecting the
created tables.
Diff: 2
Page Ref: 301
2) What is the purpose of the data manipulation component of a DBMS?
Answer: The data manipulation component allows the end users to insert, read, update, and delete
information in a database.
Diff: 2
Page Ref: 302
3) What is a single-user DBMS?
Answer: In a single-user DBMS, the data manipulation component is primarily intended for use, either
directly or indirectly, by one user at a time.
Diff: 1
Page Ref: 302
4) What is a multiuser DBMS?
Answer: In a multiuser DBMS, the data manipulation component can be used either directly or
indirectly by multiple users at the same time.
Diff: 1
Page Ref: 302
5) What is the purpose of the data administration component of a DBMS?
Answer: The database administration component is used to perform the technical, administrative, and
maintenance tasks of database systems, such as ensuring security, optimizing performance, and
providing backup and recovery.
Diff: 2
Page Ref: 302
6) What is view materialization?
Answer: View materialization refers to saving a view as an actual physical table. Such a view is referred
to as a materialized view. The idea behind view materialization is to improve the performance of queries on
frequently used views.
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Diff: 2
Page Ref: 303
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7) What is a data dictionary?
Answer: A data dictionary is a repository of the metadata (data about the data) of the database. The
data dictionary, also sometimes called the metadata repository, contains information such as the names of
the tables, names and types of columns in them, the primary keys, referential integrity constraints, and so
on. The metadata showing the structure of the functioning database system is automatically stored by the
DBMS in the data dictionary.
Diff: 2
Page Ref: 303
8) What is an encryption key?
Answer: An encryption key is a scrambling algorithm used to make data unreadable to anyone who
does not have a decryption key (the algorithm that reverts the encrypted information back to its original
state).
Diff: 2
Page Ref: 306
9) What is data backup?
Answer: Data backup refers to the practice of saving additional physical copies of the data, in addition
to the original copy.
Diff: 1
Page Ref: 306
10) What is database recovery?
Answer: Database recovery refers to recovering the content of the database after a failure.
Diff: 1
Page Ref: 306
11) What is a recovery log?
Answer: A recovery log is a file recorded to the disk that logs database updates, ensuring that even if
the update performed on the data in memory is somehow lost before it is written to the disk, the
information about the update will still be captured.
Diff: 2
Page Ref: 306
12) What is a checkpoint?
Answer: A checkpoint is a part of a recovery log. When a checkpoint is created, all updates recorded in
the recovery log—and as a result any updates to data stored in memory—are written to the database in
the data file on the disk.
Diff: 2
Page Ref: 306
13) What is the purpose of the COMMIT command?
Answer: The COMMIT command causes all updates on the database to be recorded on the disk. It is
automatically issued during the checkpoints, but can also be manually issued by the user or the DBA.
Diff: 2
Page Ref: 307
14) What is the purpose of the ROLLBACK command?
Answer: The ROLLBACK command rolls back all the updates since the last COMMIT.
Diff: 2
Page Ref: 307
15) What is a complete mirrored backup?
Answer: A complete mirrored backup is a separate, complete physical copy of the database that is
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continuously updated, so it fully corresponds to the original database.
Diff: 2
Page Ref: 307
16) What is the difference between accidental misuse and malicious data updates?
Answer: Accidental misuse refers to data updates (insert, delete, modify) that are the result of an
accident rather than a deliberate malicious attempt. Malicious data updates are the result of unauthorized
malicious misuse of a database system.
Diff: 2
Page Ref: 307
17) What is update failure?
Answer: Update failure is the failure of a database system during an update operation.
Diff: 2
Page Ref: 307
18) What is query optimization?
Answer: Query optimization refers to examining multiple ways of executing the same query and
choosing the fastest option.
Diff: 2
Page Ref: 308
19) What is a query optimizer?
Answer: A query optimizer is a feature in the DBMS that determines how to execute an SQL statement
in an efficient manner.
Diff: 2
Page Ref: 308
20) What is the query cost?
Answer: The query cost is the time length of a query execution.
Diff: 2
Page Ref: 308
21) What is a query hint?
Answer: A query hint is a suggestion for overriding the default behavior of the query optimizer.
only intended to be used by experienced database administrators for fine-tuning.
Diff: 2
Page Ref: 308
22) What is a common purpose for all database policies and standards?
Answer: A common purpose for all database policies and standards is to reflect and support the
business processes and business logic.
Diff: 2
Page Ref: 309
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It is