What do you mean by data purging?

1.	What do you mean by data purging?
Answer» When data needs to be deleted from the data warehouse, it can be a very tedious task to delete data in bulk. The term data purging refers to methods of permanently erasing and removing data from a data warehouse. Data purging, often contrasted with deletion, involves MANY different techniques and strategies. When you delete data, you are removing it on a temporary BASIS, but when you purge data, you are permanently removing the data and freeing up memory or storage space. In GENERAL, the data that is deleted is usually JUNK data such as null values or extra spaces in the row. Using this approach, users can delete MULTIPLE files at once and maintain both efficiency and speed.

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