question

Normalization produces a lower normal form.

answer

False

question

Normalization is a process that is used for changing attributes to entities.

answer

False

question

In order to meet performance requirements, you may have to denormalize portions of the database design.

answer

true

question

A table is in BCNF if every determinant in the table is a candidate key.

answer

True

question

Relational models view the data as part of a table or collection of tables in which all key values must be identified.

answer

True

question

Dependencies that are based on only a part of a composite primary key are called transitive dependencies.

answer

False

question

With partial dependencies, data redundancies occur because every row entry requires duplication of data.

answer

True

question

Converting a database format from 1NF to 2NF is a complex process.

answer

False

question

a determinant is any attribute whose value determines other values within a column.

answer

False

question

Unnormalized database tables often lead to various data redundancy disasters in production databases.

answer

True

question

1NF, 2NF, and 3NF are _____.

answer

normalization stages

question

From a structural point of view, 2NF is better than ___.

answer

1NF

question

____ yields better performance.

answer

Denormalization

question

An attribute that is part of a key is known as a ____ attribute.

answer

prime

question

Data redundancy produces ____.

answer

data integrity problems

question

A ____ exists when there are functional dependencies such that Y is functionally dependent on X and Z is functionally dependent on Y, and X is the primary key.

answer

transitive dependency

question

A ___ derives its name from the fact that a group of multiple entries of the same type can exist for any single key attribute occurrence.

answer

repeating group

question

A relational table must not contain a ___.

answer

repeating group

question

Dependencies based on only a part of a composite primary key are called ___ dependencies.

answer

partial

question

In a ___ diagram, the arrows above the attribute indicate all desirable dependencies.

answer

dependency

question

A table that has all key attributes defined, has no repeating groups, and all its attributes are dependent on the primary key, is said to be in ____.

answer

1NF

question

If you have three different transitive dependencies, ___ different determinants exist.

answer

three

question

If a table has multiple candidate keys and one of those candidate keys is a composite key, the table can have ___ based on this composite candidate key, even when the primary key chosen is a single attribute.

answer

partial dependencies

question

A table that is in 2NF and contains no transitive dependencies is said to be in ___.

answer

3NF

question

According to naming conventions described in Chapter 2, ___ would be the best name for a column representing the charges per hour in a table named JOB.

answer

JOB_CHG_HOUR

question

Improving ___ leads to more flexible queries.

answer

atomicity

question

An atomic attribute ___.

answer

cannot be further subdivided

question

THE MOST LIKELY DATA TYPE FOR A SURROGATE KEY IS ____.

answer

Numeric

question

Granularity refers to ___.

answer

the level of detail represented by the values stored in a table's row

question

From a system functionality point of view, ___ attribute values can be calculated when they are needed to write reports or invoices.

answer

derived

question

For most business transactional databases, we should normalize relations into ____.

answer

3NF

question

A table where every determinant is a candidate key is said to be in ____.

answer

BCNF

question

BCNF can be violated only if the table contains more than one ___ key.

answer

candidate

question

Most designers consider the BCNF as a special case of the ____.

answer

3NF

question

A table where all attributes are dependent on the primary key are independent of each other, and no row contains two or more multivalued facts about an entity, is said to be in ____.

answer

4NF

question

A talbe is in 4NF if it is 3NF and ____.

answer

has no multivalued dependencies

question

Normalization represents a micro view of the ___ within the ERD.

answer

entities

question

an example of denormalization is using a ___ denormalized table to hold report data. This is required when creating a tabular report in which the columns represent data that is stored in the table as rows.

answer

temporary

question

the conflicts between design efficiency, information requirements, and processing speed are often resolved through ____.

answer

compromised that include denormalization

question

___ databases reflect the ever-growing demand for greater scope and depth in the data on which decision support systems increasingly rely.

answer

Data warehouse

question

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.

answer

RDBMS

question

the price paid for increased performance through denormalization is a larger amount of ____.

answer

data redundancy

question

In order to meet ___ requirements, you may have to denormalize some portion of the database.

answer

performance

question

___ is a process to help reduce the likelihood of data anomalies.

answer

Normalization

question

Dependencies can be identified with the help of a dependency _____.

answer

diagram

question

A diagram that depicts all dependencies found within a given table structure is known as a ______.

answer

Dependency Diagram

question

data redundancies occur from ____ of data on every row entry.

answer

duplication

question

Any attribute whose value determines other values within a row is called ____.

answer

determinant

question

In a real-world environment, changing granularity requirements might dictate changes in primary key selection, and those changes might ultimately require the use of ____ keys.

answer

surrogate

question

When a nonkey attribute is the determinate of a key attribute the table is in 3NF but not ____.

answer

BCNF

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