PHYSICAL DATABASE DESIGN QUIZ

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

True

False

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What is the best data type definition for Oracle when a field is alphanumeric and has a fixed length?

NUMBER

CHAR

LONG

VARCHAR2

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Data-volume and frequency-of-use statistics are not critical inputs to the physical database design process.

False

True

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When storage space is scarce and physical records cannot span pages, creating multiple physical records from one logical relation will minimize wasted storage space.

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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Selecting a data type involves which of the following?

Improve data integrity

Represent most values

Maximize storage space

All of these

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Which of the following is an advantage of partitioning?

Extra space

Inconsistent access speed

Complexity

Security

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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 one relation.

All fields are stored in two relations.

All fields are stored in three relations.

All fields are stored in four relations.

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

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.

Be careful indexing attributes that have null values.

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Sequential retrieval on a primary key for sequential file storage has which of the following features?

Moderately fast

Very fast

Impractical

Slow

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