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What is meant by Proactive, Retroactive and Simultaneous Update ?

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What is meant by Proactive, Retroactive and Simultaneous Update ?
posted Feb 1, 2014 by Anuj Yadav

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1.Proactive Update: The updates that are applied to database before it becomes effective in real world.
2.Retroactive Update: The updates that are applied to database after it becomes effective in real world.
3.Simulatneous Update: The updates that are applied to database at the same time when it becomes effective in real world.

answer Feb 2, 2014 by Vikas Upadhyay
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