Similarities and differences of ODS, data mart and data warehouse

One 、ODS

Operational data warehouse , The earliest data warehouse model . The feature is that the data model adopts the paste source design , What is the data structure of the business system database ,ODS What is the structure of the database . The difference is ODS A database can provide a history of data changes , therefore ODS Each table in the database will add a date type , Represents the time point of the data , Save the changes of data every day , This is good for data analysis .

Two 、 Data warehouse

abbreviation EDW, Enterprise data warehouse , This is what everyone is talking about now . The difference is in each industry EDW There is a general data model , The structure is streamlined , Extensibility is strong , Strong applicability , The data model is not like ODS However, there will be a lot of redundancy .

There are two main categories ：
（1） Operational database , Characteristic of ： Business support 、 Detail data 、 Daily collection 、 Small quantity, high frequency , Such as mysql
（2） Analytical database , Characteristic of ： The historical data 、 Summary data 、 Regular updates 、 Large quantity and low frequency , Such as hive

Data warehouse features ：
1. subject-oriented ： Key areas of concern for decision-making , A theme , Multiple operational databases
2. Integrate ： Multiple data sources → Summary , Have consistent relevance
3. Relatively stable ： Long term preservation , Lots of queries , A few updates
4. Reflect historical changes ： Data of more than a few years 、 Past time analysis 、 Future forecast

Its basic composition is as follows ：

  Related conceptual tools are as follows ：

 

3、 ... and 、 The data mart

abbreviation DM, A part built from a certain application DW, Why do you say that? ,DM Only care about the data you need . We will not consider the overall data architecture and application of the enterprise , Every app has its own DM. therefore DM It can be built based on warehouse or independently .

Four 、DW And ODS The difference between

 

 

This article is collated and referenced from the following website ：

https://www.jianshu.com/p/905a89d491fb

 http://www.fangfa.net/webnews/423.html