The essence of big data is the volume of data to a certain extent, how to access, process and analyze things. Other issues such as how to build a data center, whether to use the form of data centralization can be said to have little to do with the essence of big data. The data used in big data can be centralized in one place, more likely to be distributed in many places or a place of multiple places.

It can be said that big data is a large collection of ordinary data