ELECTROLYSIS AND STORAGE BATTERIES QUIZ

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

CHAR

NUMBER

LONG

VARCHAR2

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It is usually not very important to design the physical database to minimize the time required by users to interact with the information systems.

False

True

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A field represents each component of a composite attribute.

True

False

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

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

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 on smaller tables.

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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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In general, larger block sizes are used for online transaction processing applications and smaller block sizes are used for databases with a decision support or data warehousing system.

False

True

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Which of the following is not a factor to consider when switching from small to large block size?

Block contention

The number of columns

Random row access speed

The length of all of the fields in a table row

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An extent is a contiguous section of disk storage space.

False

True

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Two basic constructs to link one piece of data with another piece of data: sequential storage and pointers.

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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