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Question - What do you understand by Proactive, Retroactive and Simultaneous Update?

Answer -

Proactive Update: These updates are applied to the database before it becomes effective in the real-world environment.
Retroactive Update: These retroactive updates are applied to a database after it becomes effective in the real-world environment.
Simultaneous Update: These updates are applied to the database at the same instance of time as it becomes effective in a real-world environment.

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