Database - Physical Database Design

Exercise : Physical Database Design - General Questions
11.
A secondary key is which of the following?
Nonunique key
Primary key
Useful for denormalization decisions
Determines the tablespace required
Answer: Option
Explanation:
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12.
The fastest read/write time and most efficient data storage of any disk array type is:
RAID-0.
RAID-1.
RAID-2.
RAID-3.
Answer: Option
Explanation:
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13.
A rule of thumb for choosing indexes for a relational database includes which of the following?
Indexes are more useful on smaller tables.
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.
Be careful indexing attributes that have null values.
Answer: Option
Explanation:
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14.
Sequential retrieval on a primary key for sequential file storage has which of the following features?
Very fast
Moderately fast
Slow
Impractical
Answer: Option
Explanation:
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15.
A multidimensional database model is used most often in which of the following models?
Data warehouse
Relational
Hierarchical
Network
Answer: Option
Explanation:
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