First of all, big data is defined as a data set whose scale far exceeds the capabilities of traditional database software tools in terms of acquisition, storage, management and analysis. It has four characteristics: massive data scale, rapid data flow, diverse data types and low value density. The three characteristics of big data are large amount of data, complex structure and fast update speed.

We all know that haste makes waste. Whatever it is, it can't be done overnight. We all need perseverance to achieve our goals. In fact, in real life, many training courses cheat consumers under the guise of this crash. So let's not be so lucky. We still have to learn to persist.