A graph database (Neo4j) is best served by keeping all data on one machine.
Following linked data does not work well over network connections,
that are very slow compared to in-memory.
Plus there is a price of software for each server...
So what is the biggest "box" that can be built, and a what price?
Coding Horror: Scaling Up vs. Scaling Out: Hidden Costs
Three years later, Mr. Moore is still letting us punt on database sharding by David of 37signals
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