DBMS Merge Join Algorithm MCQs

DBMS Merge Join Algorithm MCQs: This section contains multiple-choice questions and answers on Merge Join Algorithm in DBMS.
Submitted by Anushree Goswami, on May 14, 2022

1. A merge join is used to perform a/an ___.

  1. Equi-join
  2. Natural join
  3. Both A and B
  4. None of the above

Answer: C) Both A and B

Explanation:

A merge join is used to perform an equi-join and a natural join.

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2. An algorithm called the ___ algorithm is used for performing the merge join.

  1. Merge
  2. Join
  3. Merge Join
  4. None

Answer: C) Merge Join

Explanation:

An algorithm called the Merge Join algorithm is used for performing the merge join.

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3. What is ___ algorithm also known as?

  1. Join algorithm
  2. Merge algorithm
  3. Sort-merge-join algorithm
  4. None

Answer: C) Sort-merge-join algorithm

Explanation:

Merge Join algorithm is also known as Sort-merge-join algorithm.

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4. We can perform a ___ join for some attribute values that are larger than the memory size.

  1. Block nested-loop
  2. Nested-loop
  3. Loop
  4. None

Answer: A) Block nested-loop

Explanation:

We can perform a block nested-loop join for some attribute values that are larger than the memory size.

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5. A ___ is associated with each relation in the merge join algorithm.

  1. Join
  2. Query
  3. Pointer
  4. None

Answer: C) Pointer

Explanation:

A pointer is associated with each relation in the merge join algorithm.

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6. The pointer initially points to the ____ tuple of the relation; as soon as the algorithm advances, it moves to the next one.

  1. Last
  2. First
  3. Middle
  4. Upper

Answer: B) First

Explanation:

The pointer initially points to the first tuple of the relation; as soon as the algorithm advances, it moves to the next one.

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7. Even if the number of relations is large, each set of tuples must fit in memory.

  1. Columns
  2. Attributes
  3. Tuples
  4. None

Answer: C) Tuples

Explanation:

Even if the number of relations is large, each set of tuples must fit in memory.

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8. Prior to applying the merge join algorithm, we must ____ the given input relations r and s if any of the join attributes are not sorted.

  1. Query
  2. Add
  3. Delete
  4. Sort

Answer: D) Sort

Explanation:

Prior to applying the merge join algorithm, we must sort the given input relations r and s if any of the join attributes are not sorted.

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9. Putting ____ that share the same join attribute values consecutively is possible if the relations are sorted.

  1. Tuples
  2. Attributes
  3. Columns
  4. None

Answer: A) Tuples

Explanation:

Putting tuples that share the same join attribute values consecutively is possible if the relations are sorted.

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10. Our new '_____' technique prevents ourselves from such expensive access.

  1. Hybrid Merge Join
  2. Merge Join
  3. Join
  4. None

Answer: A) Hybrid Merge Join

Explanation:

Our new 'Hybrid Merge Join' technique prevents ourselves from such expensive access.

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