"Unnormalized form" should not be confused with denormalization, where normalization is deliberately compromised for selected tables in a relational database.
[1] IBM organized the first international workshop exclusively on this topic in 1987 which was held in Darmstadt, Germany.
For example, an JSON or XML database might support duplicate records and intrinsic ordering.
As of 2016, companies like Google, Amazon and Facebook deal with large amounts of data that are difficult to store efficiently.
They use NoSQL databases, which are based on the principles of the unnormalized relational model, to deal with the storage issue.