Lakshya Education MCQs

Question: Which of the following is not a factor to consider when switching from small to large block size?
A.The length of all of the fields in a table row
B.The number of columns
C.Block contention
D.Random row access speed
Answer: Option B

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More Questions on This Topic :

Question 1. What is the best data type definition for Oracle when a field is alphanumeric and has a fixed length?
  1.    VARCHAR2
  2.    CHAR
  3.    LONG
  4.    NUMBER
Answer: Option B
Question 2. A secondary key is which of the following?
  1.    Nonunique key
  2.    Primary key
  3.    Useful for denormalization decisions
  4.    Determines the tablespace required
Answer: Option A
Question 3. 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
Answer: Option A
Question 4. 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.
Answer: Option D
Question 5. 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.
Answer: Option D
Question 6. 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.
Answer: Option B

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