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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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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