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Facebook's Ryan Mack gave a MySQL Tech Talk where he talked about using what he called Non-stored Procedures for adding edges to Facebook's social graph. The question is: how can edges quickly be added to the social graph? The answer is ultimately one of deciding where logic should be executed, especially when locks are kept open during network hops.
Ryan explained a key element of the Facebook data model are the connections between people, things they've liked, and places they've checked-in. A lot of their writes are adding edges to the social graph.
Currently this is a two step process, run inside a transaction:
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