Database outline

Relational database （Mysql and Oracle）

Tables and tables 、 Tables and fields 、 There is a relationship between data and data
advantage :
　　1. There is a relationship between the data , It is very convenient to add, delete, modify and check data
　　2. Relational database has transaction operation , Ensure data integrity and consistency .
shortcoming ：
　　1. Because data and data are related , The bottom layer is running a large number of algorithms , A large number of algorithms will reduce the efficiency of the system , It can degrade performance
　　2. When faced with the addition, deletion, modification and query of massive data, it will be powerless
　　3. Massive data, data maintenance becomes very weak
Common applications :
　　 It is suitable for processing data of general magnitude （ Bank transfers and money ）

Non relational database （redis and MangDB）

In order to deal with massive data , Non relational database is designed to replace relational database at the beginning
advantage ：
　　1. It is possible to add, delete, modify and check massive data
　　2. The maintenance and processing of massive data is very easy
shortcoming ：
　　1. Data has nothing to do with data , They exist alone
　　2. Non relational databases have no relationship , There is no strong transactional relationship , There is no guarantee of data integrity and security