The TokuDB storage engine for MySQL employs Fractal Tree technology. We’ve been planning to write a white paper explaining how fractal tree indexing works, but haven’t gotten to it yet. In the mean time, here are links to some academic papers that relate to our technology.
The research groups’ web pages can be found at
Incidentally, there’s another data structure in the literature called a `Fractal Tree’ (see e.g. http://www.pdl.cmu.edu/ftp/Database/fpbtree.ps), which is unrelated to our work.
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