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MCQs

Total Questions : 46 | Page 4 of 5 pages
Question 31.  Selecting a data type involves which of the following?
  1.    Maximize storage space
  2.    Represent most values
  3.    Improve data integrity
  4.    All of the above.
 Discuss Question
Answer: Option C. -> Improve data integrity
Question 32.  If a denormalization situation exists with a one-to-one binary relationship, which of the following is true?
  1.    All fields are stored in one relation.
  2.    All fields are stored in two relations.
  3.    All fields are stored in three relations.
  4.    All fields are stored in four relations.
 Discuss Question
Answer: Option A. -> All fields are stored in one relation.
Question 33.  Which of the following improves a query's processing time?
  1.    Write complex queries.
  2.    Combine a table with itself.
  3.    Query one query within another.
  4.    Use compatible data types.
 Discuss Question
Answer: Option D. -> Use compatible data types.
Question 34.  What is the best data type definition for Oracle when a field is alphanumeric and has a length that can vary?
  1.    VARCHAR2
  2.    CHAR
  3.    LONG
  4.    NUMBER
 Discuss Question
Answer: Option A. -> VARCHAR2
Question 35.  The blocking factor is:
  1.    a group of fields stored in adjacent memory.
  2.    the number of physical records per page.
  3.    attributes grouped together by the same primary key.
  4.    attributes grouped together by the same secondary key.
 Discuss Question
Answer: Option B. -> the number of physical records per page.
Question 36.  If a denormalization situation exists with a many-to-many or associative binary relationship, which of the following is true?
  1.    All fields are stored in one relation.
  2.    All fields are stored in two relations.
  3.    All fields are stored in three relations.
  4.    All fields are stored in four relations.
 Discuss Question
Answer: Option B. -> All fields are stored in two relations.
Question 37.  Which of the following is an advantage of partitioning?
  1.    Complexity
  2.    Inconsistent access speed
  3.    Extra space
  4.    Security
 Discuss Question
Answer: Option D. -> Security
Question 38.  Which of the following are integrity controls that a DBMS may support?
  1.    Assume a default value in a field unless a user enters a value for that field.
  2.    Limit the set of permissible values that a field may assume.
  3.    Limit the use of null values in some fields.
  4.    All of the above.
 Discuss Question
Answer: Option D. -> All of the above.
Question 39. . 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 40. . 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

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