When the primary copy protocol is used for replicated data,secondary copies are updated at the same time as the primary copy to keep the database consistent.

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Quizplus · Accepted Answer

In the primary copy protocol, updates are first applied to the primary copy, and then, depending on the specific protocol implementation, the changes may be propagated to the secondary copies either synchronously or asynchronously, but not necessarily at the exact same time.

When the Primary Copy Protocol Is Used for Replicated Data,secondary