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the practice of examining large pre-existing databases in order to generate new information is datamining. it refers loosely to the process of semi-automatically analysing large databases to find useful patterns.
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The answer is 1) Data mining.

Data warehousing is used for storing the large data.

Data mirroring is maintaining the replicas.
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Data mining refers loosely to the process of semi-automatically analysing large databases to find useful patterns.

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