CLIENT SERVER DATABASE QUIZ

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

False

True

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A field represents each component of a composite attribute.

False

True

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An extent is a contiguous section of disk storage space.

False

True

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

Use compatible data types.

Combine a table with itself.

Query one query within another.

Write complex queries.

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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.

False

True

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

False

True

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

Be careful indexing attributes that have null values.

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

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

Indexes are more useful on smaller tables.

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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.

False

True

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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 one relation.

All fields are stored in three relations.

All fields are stored in two relations.

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

True

False

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