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A B+ tree consists of a root, internal nodes and leaves. [1] The root may be either a leaf or a node with two or more children. A B+ tree can be viewed as a B-tree in which each node contains only keys (not key–value pairs), and to which an additional level is added at the bottom with linked leaves.
Download QR code; Print/export Download as PDF; ... keys plus one more key brought down from the neighbor's parent. The result is ... Animated B-Tree visualization;
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A B-tree can be seen as a very specialized form of n-ary tree, one that adds a pile of special restrictions. The restrictions make insertion and deletion a little more complicated -- but, in return, the B-tree can guarantee very fast searches. Some nodes in some n-ary trees have only 1 or 2 children.
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The distinction does make sense for databases which store whole table data in a tree, such as InnoDB (which uses a normal B-tree) or Oracle's index-organized tables (and others). Postgres always stores table data in a heap, not a tree, thus the B+ tree/B-tree classificaiton is not applicable. -- intgr 23:03, 25 December 2012 (UTC)
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