Discussion
The problem of concurrency control is more complex in a distributed database.
Answer: A
Correct answer: True
A centralised system controls concurrency with one lock manager holding the whole picture. Distributing it means locks held at several sites, messages that may be delayed or lost, and deadlocks whose cycle spans sites and which no single site can see. This is why timestamping, which avoids locks altogether, is attractive in a distributed setting.
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