WaterfallTree（瀑布树）详细技术分析系列

2013-07-30 18:59 灵感之源阅读(3712) 评论(5) 编辑收藏举报

前言

参考

关于STSdb，我之前写过几篇文章，譬如：

技术分析

STSdb其中一个最重要的部分是WaterfallTree(瀑布树)这个新发现的存储结构。

详细的官方原文，可以在这里找到：WaterfallTree™ The Technology。

搬运

鉴于有同学说无法访问官方网站，我在这里搬运一下英文原版，等有空的时候再翻译成中文

应用技术

W-tree is a natural generalization of B⁺-tree. Operations in B⁺-tree are executed synchronously (one by one), while in W-tree, operations are executed asynchronously (in groups). When an operation enters B⁺-tree it "sinks" up to its respective leaf. When an operation enters W-tree it „stops” in the first node which is not overloaded.Operations in W-tree accumulate in its internal nodes. When a certain internal node overloads with operations, the branch with the greatest number of operations adjacent to it is selected and they are „poured down“ the tree. The W-tree data structure solves the problem of speed degradation when indexing records with random keys.