Database is a computer software system that stores and manages data according to data structure. Databases are stored together in a certain way, can be shared by multiple users, have as little redundancy as possible, and are independent of applications. They can be regarded as places where electronic files are stored, and users can add, query, update and delete the data in the files.
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Type of database
1, relational database
In a relational database, the storage format can intuitively reflect the relationship between entities. Common relational databases are Mysql, SqlServer and so on. In lightweight or small applications, the use of different relational databases has little effect on the performance of the system, but when building large applications, it is necessary to choose the appropriate relational database according to the business requirements and performance requirements of the application.
2. Non-relational database (NoSQL)
A distributed, non-relational data storage system is not guaranteed to conform to the ACID principle. NoSQL database technology has obvious application advantages, relatively simple database structure and good reading and writing performance under large data volume; It can meet the requirements of storing custom data formats at any time, and is very suitable for big data processing.
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