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MCQs

Total Questions : 46 | Page 2 of 5 pages
Question 11. A secondary key is which of the following?
  1.    Nonunique key
  2.    Primary key
  3.    Useful for denormalization decisions
  4.    Determines the tablespace required
 Discuss Question
Answer: Option A. -> Nonunique key
Question 12. The fastest read/write time and most efficient data storage of any disk array type is:
  1.    RAID-0
  2.    RAID-1
  3.    RAID-2
  4.    RAID-3
 Discuss Question
Answer: Option A. -> RAID-0
Question 13. A rule of thumb for choosing indexes for a relational database includes which of the following?
  1.    Indexes are more useful on smaller tables.
  2.    Indexes are more useful for columns that do not appear frequently in the WHERE clause in queries.
  3.    Do not specify a unique index for the primary key of each table.
  4.    Be careful indexing attributes that have null values.
 Discuss Question
Answer: Option D. -> Be careful indexing attributes that have null values.
Question 14. Sequential retrieval on a primary key for sequential file storage has which of the following features?
  1.    Very fast
  2.    Moderately fast
  3.    Slow
  4.    Impractical
 Discuss Question
Answer: Option A. -> Very fast
Question 15. A multidimensional database model is used most often in which of the following models?
  1.    Data warehouse
  2.    Relational
  3.    Hierarchical
  4.    Network
 Discuss Question
Answer: Option A. -> Data warehouse
Question 16. Two basic constructs to link one piece of data with another piece of data: sequential storage and pointers.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 17. Denormalization and clustering can work well to minimize data access time for small records.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 18. Hashing algorithm converts a primary key value into a record address.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 19. The primary goal of physical database design is data processing efficiency.
  1.    True
  2.    False
 Discuss Question
Answer: Option A. -> True
Question 20. A bitmap index is an index on columns from two or more tables that come from the same domain of values.
  1.    True
  2.    False
 Discuss Question
Answer: Option B. -> False

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