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MCQs

Total Questions : 30 | Page 1 of 3 pages
Question 1. If a denormalization situation exists with a one-to-one binary relationship, which of the following is true?
  1.    All fields are stored in four relations.
  2.    All fields are stored in two relations.
  3.    All fields are stored in three relations.
  4.    All fields are stored in one relation.
 Discuss Question
Answer: Option D. -> All fields are stored in one relation.
Question 2. Selecting a data type involves which of the following?
  1.    Maximize storage space
  2.    Improve data integrity
  3.    Represent most values
  4.    All of these
 Discuss Question
Answer: Option B. -> Improve data integrity
Question 3. 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 4. 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 four relations.
  2.    All fields are stored in two relations.
  3.    All fields are stored in one relation.
  4.    All fields are stored in three relations.
 Discuss Question
Answer: Option B. -> All fields are stored in two relations.
Question 5. Which of the following is an advantage of partitioning?
  1.    Security
  2.    Inconsistent access speed
  3.    Extra space
  4.    Complexity
 Discuss Question
Answer: Option A. -> Security
Question 6. What is the best data type definition for Oracle when a field is alphanumeric and has a fixed length?
  1.    CHAR
  2.    LONG
  3.    NUMBER
  4.    VARCHAR2
 Discuss Question
Answer: Option A. -> CHAR
Question 7. Which of the following is not a factor to consider when switching from small to large block size?
  1.    Random row access speed
  2.    The length of all of the fields in a table row
  3.    The number of columns
  4.    Block contention
 Discuss Question
Answer: Option C. -> The number of columns
Question 8. The blocking factor is:
  1.    the number of physical records per page.
  2.    a group of fields stored in adjacent memory.
  3.    attributes grouped together by the same secondary key.
  4.    attributes grouped together by the same primary key.
 Discuss Question
Answer: Option A. -> the number of physical records per page.
Question 9. Which of the following improves a query's processing time?
  1.    Use compatible data types.
  2.    Combine a table with itself.
  3.    Write complex queries.
  4.    Query one query within another.
 Discuss Question
Answer: Option A. -> Use compatible data types.
Question 10. 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 use of null values in some fields.
  3.    All of these
  4.    Limit the set of permissible values that a field may assume.
 Discuss Question
Answer: Option C. -> All of these

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