Why data Tiering

1. Trade space for time , Through a lot of preprocessing to improve the efficiency of the application system , Therefore, there will be a lot of redundant data in the data warehouse .
2. The data cleaning process can be simplified through hierarchical data management , It's equivalent to breaking a complex job into multiple simple jobs , When the data goes wrong , Often we just need to adjust a certain step .
3. If it's not layered , If the original business system changes, it will affect the whole data cleaning process , Huge workload