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In a distribute transaction -- one in which "DATABASE A" calls "DATABASE B", only "DATABASE A" may commit -- the reason -- "database B" has no mechanism for co-ordinating with "database a" on the commit. We need to do a 2 phase commit to ensure that when the transaction commits any work performed on DATABASE A is committed *as well as* any work on database b.

This is the reason will do no allow for ANY node other then the "parent" node of the transaction to issue a commit or rollback in a distributed transaction. The other nodes simply do not have control over the other possible nodes in the transaction.