Question: Two processes, A and B, each need three records, 1, 2, and 3, in a database. If A asks for them in the order 1,

Two processes, A and B, each need three records, 1, 2, and 3, in a database. If A asks for them in the order 1, 2, 3, and B asks for them in the same order, deadlock is not possible. However, if B asks for them in the order 3, 2, 1, then deadlock is possible. With three resources, there are 3! or six possible combinations in which each process can request them. What fraction of all the combinations is guaranteed to be deadlock free?

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