ValueTypeB_PLUS_TREE_INTERNAL_PAGE_TYPE::ValueAt(intindex)const返回index处的Value ValueTypeB_PLUS_TREE_INTERNAL_PAGE_TYPE::Lookup(constKeyType &key,constKeyComparator &comparator)const找到key对应的value,由于key有序,这里推荐二分intB_PLUS_TREE_INTERNAL_PAGE_TYPE::KeyIndex(constKeyType &key,constK...
基于这个原因,有人对B树进行了改良,提出了B+树(B plus tree)。 也就是下边这个样子 根据B+树的图,我们可以轻易总结出以下几个不同点: 1、 在B+树中,如果一个节点包含n个关键字,那么他就有n个分支。 在B树中,含有n个关键字的节点有n+1个分支。 也就是说B+树是一个关键字对应一个分支,B树是一个关...
注意 BPlusTree 的开头,那儿定义了两个 using 别名方便我们reinterpret_cast的时候使用 usingInternalPage=BPlusTreeInternalPage<KeyType,page_id_t,KeyComparator>;usingLeafPage=BPlusTreeLeafPage<KeyType,ValueType,KeyComparator>; 帮助函数 另外,推荐在b_plus_tree.cpp实现一个函数GetLeafPage(),功能是根据 Key ...
索引中的平衡树:b-tree,b-plus-tree 主要介绍数据库的索引,及其实现,平衡多叉树 什么是索引 想象一下,假设db没有任何数据结构驻留在内存,其一切存储都放在disk,那么想找到一张表的一个行,就必须把表的所有页取到memory,逐个比较各行. 因此我们必须放置一些特定的数据结构在内存中,方便快速查找(但不是缓存)(...
With the properties of B+ tree, EBTree could support real-time top-k, range, equivalent search on Ethereum blockchain data. Besides, EBTree takes up relatively small s-torage space because it only stores the identifiers of blockchain data. Meanwhile, considering of the time intervals of ...
This is a pure go implementation of B plus tree in memory. It's a toy project and not recommended to be used in production environment. The algorithm is from the chapter 14 of Database System Concepts 7th Edition. You can submit issues if you have any questions. ...
add nodes to the tree with the lowest edge weight and highest genotype abundance (c, d); when edges have the same weight (e), we choose that connected to the node with the highest abundance (f), we repeat until all nodes were added to the tree (g), the final tree is shown in (...
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