Why study big data
1) There are relatively few people engaged in, because the threshold is high, the rare is the most expensive, and the money is made.
2) The capacity of a single machine is limited. In the past, the hard disk was only 60G , the storage capacity was limited, and the data backup mechanism was too weak
3) To provide a theoretical basis for the decision-making of upper-level leaders
4) Huge potential value, for example: shared bicycles can collect the places where there are many people, and put more vehicles
5) The railway department dispatches and arranges trains according to the flow of personnel
Case 1: The traffic police department records illegal photos, and the photos of traffic light shooting for N years cannot be stored on a single machine
Case 2: Bank flow records, N years of records cannot be stored on a single machine
Case 3: Mobile communication, the number of daily call bills is huge
Case 4: Where can shared bicycles collect more people and place more vehicles
Case 5: 12306 decides train scheduling based on big data and arranges Spring Festival travel
Case 6: Urban population density survey, crime prevention
Case 7: The police collect intelligence based on big data
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