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What is meant by Proactive, Retroactive and Simultaneous Update in DBMS?

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Proactive Update: The updates that are applied to database before it becomes

effective in real world.

Retroactive Update: The updates that are applied to database after it becomes https://madanswer.com/java

effective in real world.

Simultaneous Update: The updates that are applied to database at the same time

when it becomes effective in real world.
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