Suppose the nested transaction model were extended so that subtransactions were distributed over different sites in a network. At what point in the execution of a distributed nested transaction would a cohort enter the prepared state? Explain your reasoning.
What will be an ideal response?
If the conditional commit implies that a vote message is sent to the parent then the child must enter the prepared state at that time. Alternatively, if the coordinator polls all subtransactions that have conditionally committed when the nested transaction as a whole completes then the child need not enter the prepared state until it is polled.
Computer Science & Information Technology
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