详细的官方原文，可以在这里找到：WaterfallTree™ The Technology。
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.
One head move a lot of work done.
B+tree vs Waterfall Tree