B*-tree

A B*-tree is a tree data structure, a variety of B-tree used in the HFS and Reiser4 file systems, which requires non-root nodes to be at least 2/3 full instead of 1/2. To maintain this, instead of immediately splitting up a node when it gets full, its keys are shared with the node next to it. When both are full, then the two of them are split into three. It also requires the 'leftmost' key never to be used. The term is not in general use today as... more

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