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Which of the following is correct?
  • a)
    B tress are for storing data on disk and B+ trees are for main memory.
  • b)
    Range queries are faster on B+ trees.
  • c)
    B trees are for primary indexes and B+ trees are for secondary indexes.
  • d)
    The height of a B+ tree is independent ofthe number of records.
Correct answer is option 'B'. Can you explain this answer?
Verified Answer
Which of the following is correct?a)B tress are for storing data on di...
Most database systems use indexes built on some form of a B+ tree due to its many advantages, in particular its support for range queries. Leaf nodes are linked together in B* trees hence range queries are faster.
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Most Upvoted Answer
Which of the following is correct?a)B tress are for storing data on di...
The Correct Answer is Option 'B': Range queries are faster on B trees.

Explanation:

B trees and B+ trees are data structures used for indexing in a database. Both are balanced trees, but B+ trees have some advantages over B trees, which make them suitable for secondary indexes. Let's discuss the given options in detail:

a) B trees are for storing data on disk and B+ trees are for main memory.

This statement is incorrect. Both B trees and B+ trees are used for indexing data in a database. However, B+ trees are preferred for secondary indexes because they have better cache utilization and support range queries.

b) Range queries are faster on B+ trees.

This statement is correct. B+ trees are optimized for range queries. In a B+ tree, all leaf nodes are linked together in a doubly linked list, making range queries faster. Also, B+ trees store all data in the leaf nodes, making range queries more efficient.

c) B trees are for primary indexes and B+ trees are for secondary indexes.

This statement is partially correct. B trees are suitable for primary indexes because they have a smaller height than B+ trees. However, B+ trees are preferred for secondary indexes because they have better cache utilization and support range queries.

d) The height of a B tree is independent of the number of records.

This statement is incorrect. The height of a B tree increases with the number of records, but it increases at a slower rate than a binary tree. This is because B trees are balanced trees, and each node can hold multiple keys and pointers.

Conclusion:

In a nutshell, B+ trees are preferred over B trees for secondary indexes because they have better cache utilization and support range queries. Range queries are faster on B+ trees because they store all data in the leaf nodes and have a doubly linked list of leaf nodes.
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Which of the following is correct?a)B tress are for storing data on disk and B+ trees are for main memory.b)Range queries are faster on B+ trees.c)B trees are for primary indexes and B+ trees are for secondary indexes.d)The height of a B+ tree is independent ofthe number of records.Correct answer is option 'B'. Can you explain this answer?
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