In a B-tree, when splitting a node due to an insertion that exceeds its capacity, where does the middle key go?
Question
In a B-tree, when splitting a node due to an insertion that exceeds its capacity, where does the middle key go?
Solution
When a node in a B-tree exceeds its capacity due to an insertion, it needs to be split. The process is as follows:
- The node is divided into two nodes.
- The middle key of the original node is moved up and inserted into the parent node.
- If the parent node is also full, the same process is repeated until a parent node with space is found or a new root is created.
So, in summary, the middle key goes to the parent node.
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