Comment 2 for bug 635745

I understand your two-table scenario. It would be nice if it is documented better. I will use it in my future testing.

My point were situations where building the graph would be costly, so people may prefer to dump and restore it rather than build it on server startup. At this time, once your graph is sufficiently large, it is not possible to take any data out of it, including via ALTER TABLE ENGINE , so keeping a copy in some other engine is imperative.