B+- Tree Index: The B+ tree index is used for speeding up retrieval of data. It is a pointer to data. Following the pointer chains, the value is either found or not found. The data pointers point to the leaf nodes. A leaf node has an additional pointer. Each node is filled at least half except the root node. It must have two entries minimum. Searching of a value starts at the root node and follows pointer chains till it does not reach a leaf node. The leaf nodes and internal nodes have key values which are used for searching for entries in the index. The tree is balanced because each path from the root node to the leaf node is similar in length. The same number of nodes are needed for each search.

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Chapter 16, Problem 16E

Program Plan Intro

B+- Tree Index:

The B+ tree index is used for speeding up retrieval of data. It is a pointer to data.

Following the pointer chains, the value is either found or not found.

The data pointers point to the leaf nodes. A leaf node has an additional pointer.

Each node is filled at least half except the root node. It must have two entries minimum.

Searching of a value starts at the root node and follows pointer chains till it does not reach a leaf node.

The leaf nodes and internal nodes have key values which are used for searching for entries in the index.

The tree is balanced because each path from the root node to the leaf node is similar in length. The same number of nodes are needed for each search.

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