In a SQL deadlock graph the direction of the arrows is an interesting thing.

pic02

With my mechanistic head on, I am imagining it as …

  1. Spid-a requested a lock, and then got a lock (a two-way trip)
  2. Spid-b requested a lock, and then got a lock (arrow ends-up pointing at spid)
  3. Spid-a requested a lock, and is waiting (a one-way thing)
  4. Spid-b requested a lock, and is waiting (arrow pointing away from spid)
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