Extend the definition of two-phase locking to apply to distributed transactions. Explain how this
is ensured by distributed transactions using strict two-phase locking locally.
What will be an ideal response?
Two-phase locking in a distributed transaction requires that it cannot acquire a lock at any server after it has
released a lock at any server.
A client transaction will not request commit (or abort) (at the coordinator) until after it has made all its requests
and had replies from the various servers involved, by which time all the locks will have been acquired. After
that, the coordinator sends on the commit or abort to the other servers which release the locks. Thus all locks
are acquired first and then they are all released, which is two-phase locking
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