PHYSICAL DATABASE DESIGN QUIZ

A rule of thumb for choosing indexes for a relational database includes which of the following?

Be careful indexing attributes that have null values.

Do not specify a unique index for the primary key of each table.

Indexes are more useful for columns that do not appear frequently in the WHERE clause in queries.

Indexes are more useful on smaller tables.

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If a denormalization situation exists with a many-to-many or associative binary relationship, which of the following is true?

All fields are stored in four relations.

All fields are stored in three relations.

All fields are stored in one relation.

All fields are stored in two relations.

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Which of the following improves a query's processing time?

Use compatible data types.

Combine a table with itself.

Write complex queries.

Query one query within another.

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An extent is a contiguous section of disk storage space.

False

True

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The three newest database architectures in use today are relational, multidimensional and hierarchical.

True

False

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Denormalization and clustering can work well to minimize data access time for small records.

False

True

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The primary goal of physical database design is data processing efficiency.

False

True

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Distributing the columns of a table into several separate physical records is known as horizontal partitioning.

True

False

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If a denormalization situation exists with a one-to-one binary relationship, which of the following is true?

All fields are stored in four relations.

All fields are stored in one relation.

All fields are stored in two relations.

All fields are stored in three relations.

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A bitmap index is an index on columns from two or more tables that come from the same domain of values.

True

False

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