Answer: Denormalize is the mechanism is carried out by addition of the redundant bits in the already normalized database.The data is attached in the form of attributes,adding new tables.
This technique is used in the case of previously normalized data collection which requires improvement in the performance by reducing the errors.The improvement is made by making database readable ,adding group of data in redundant form etc.
When data is to be retrieved quickly then also denormalization is used as by grouping or collecting information into a single table.
