A B-tree of order 4 is built from scratch by 10 successive insertions. What is the maximum number of node-splitting operations that may take place?
Question
A B-tree of order 4 is built from scratch by 10 successive insertions. What is the maximum number of node-splitting operations that may take place?
Solution
The maximum number of node-splitting operations in a B-tree of order 4 during 10 successive insertions can be calculated as follows:
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For the first 4 insertions, no splitting is required because a B-tree of order 4 can hold up to 3 keys and 4 pointers.
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On the 5th insertion, the root node is full and needs to be split. This results in 1 split operation.
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For the next 3 insertions (6th, 7th, and 8th), no additional splitting is required because the new root after the first split can hold up to 3 keys and 4 pointers.
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On the 9th insertion, one of the child nodes is full and needs to be split. This results in another split operation.
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On the 10th insertion, if the key is inserted into the node that was just split, another split operation will be required.
So, the maximum number of node-splitting operations that may take place during 10 successive insertions into a B-tree of order 4 is 3.
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