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Exam 6: Normalization of Database Tables

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Question 51

True/False

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The advantage of higher processing speed must be carefully weighed against the disadvantage of data anomalies.

A) True
B) False

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Question 52

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When designing a database,you should ____.

A) make sure entities are in normal form before table structures are created
B) create table structures then normalize the database
C) only normalize the database when performance problems occur
D) consider more important issues such as performance before normalizing

E) None of the above
F) A) and B)

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Question 53

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If you have three different transitive dependencies,____ different determinant(s) exist.

In a(n) ____ diagram,the arrows above the attributes indicate all desirable dependencies.

The most likely data type for a surrogate key is ____.

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

Because a partial dependency can exist only if a table's primary key is composed of several attributes,if a table in 1NF has a single-attribute primary key,then the table is automatically in 2NF.

A table is in 2NF if it is in 1NF and it includes no partial dependencies.

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

When a nonkey attribute is the determinant of a key attribute the table is in 3NF but not _________________________.

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 ____.

In _________________________ no row may contain two or more multivalued facts about an entity.

From a strictly database point of view,____ attribute values can be calculated when they are needed to write reports or invoices.

A relational table must not contain ____________________ groups.

A relational table must not contain a(n) ____.

According to the Data-Modeling Checklist,____________________ should be nouns that are familiar to business and should be short and meaningful,and should document abbreviations,synonyms,and aliases for each entity.

Describe a dependency diagram and explain its purpose.

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.

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

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