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Physical Database Design

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

LONG
VARCHAR2
NUMBER
CHAR

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

The length of all of the fields in a table row
The number of columns
Block contention
Random row access speed

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

VARCHAR2
NUMBER
CHAR
LONG

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

Moderately fast
Slow
Very fast
Impractical

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

False
True

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Physical Database Design
A multidimensional database model is used most often in which of the following models?

Data warehouse
Hierarchical
Network
Relational

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