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lec9 - Outline B-Tree Motivation Denition and properties...

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Outline: B-Tree Motivation Definition and properties Find Insertion Deletion The Data Structure Multiple keys in a node Multiple pointers in a node Lecture 9, B-Tree p. 1
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Motivation Considering the page access of a real sys- tem; try to minimize the number of page accesses. Definition, and Properties Each node stores [ b - 1 , 2 b - 1] keys. (The root node is exceptional.) Each node has [ b, 2 b ] children. (The root node is exceptional.) A node is full , if it contains 2 b - 1 keys All leaves are in the same level of the tree Height of the tree: Θ(log b n ) Lecture 9, B-Tree p. 2
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Find a value in a B-tree, starting from its root node Do Search in the root node If the key is found, return it Else, move to the proper subtree Until the subtree is empty Return false Lecture 9, B-Tree p. 3
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Splitting When a key is inserted into a full node, the node is split into two nodes. There are 2 b keys to consider.
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