Significance of De-normalization

De-normalization is adding of  redundant data to already normalized data set to improve performance without incurring additional  data maintenance and sacrificing the integrity of data

Why should you De-normalize?

While normalization makes it easy to input correct data , it also  makes it difficult to get it out. This is why you  should de-normalization your data. The advantages of de-normalization are faster selects & reduced joins at the cost of slower updates and additional storage.

Personally  I have seen up to 300% performance improvement with de-normalization  when complex joins are  involved. I fully support  exploring of de-normalization to dba’s/developers.

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