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Simple understanding of MySQL database
2022-07-06 19:02:00 【Even if it's not known by others】
MySQL Database simple understanding
List of articles
Basic concepts of database
data (Data)
- A symbolic record of things
- Including digital , written words 、 graphics 、 Images 、 voice 、 Records, etc
- With “ Record ” Forms are stored in a unified format
surface
- Organize different records together
- Used to store specific data
database
- Set of tables , It's a warehouse for storing data
- A collection of interrelated data stored in a certain organization
- It's organized according to the data structure 、 Warehouse for storing and managing data
Database management system (DBMS)
- Is to achieve effective organization of database resources 、 System software for management and access
- Establishment and maintenance of database 、 Data definition function 、 Data manipulation function 、 Database operation and management functions 、 Communications functions
Database system
- It's a human computer system , By hardware 、OS、 database 、DBMS、 Application software and database users
- The user can go through DBMS Or the application operates the database
The development of database
First generation database
- since 20 century 60 s , The first generation database system came out
- It is a database system of hierarchical model and mesh model
- It provides strong support for unified management and data sharing
Second generation database
- 20 century 70 s , Second generation database —— Relational databases are beginning to appear
- 20 century 80 s ,IBM The company's relational database system DB2 available , Start to gradually replace the database of hierarchical and mesh model , Become the mainstream of the industry
- up to now , Relational database system still occupies the main position of database application
Third generation database
- since 20 century 80 s , New database systems adapted to different fields are emerging
- Object oriented database system , Practical 、 It has a wide range of adaptability
- 20 century 90 Late S , A variety of database systems support applications together — Some new elements have been added to mainstream database systems
for example ,Oracle Supported by “ Relationship ( object ” database model
The second generation database relational database stores rows in the form of tables – Column
Third generation database non relational data e file , picture , Key value pair , label , Sequence, etc
Document database , Index type , The time series
Introduction to mainstream database
SQLServer ( Microsoft products )
- oriented Windows operating system
- Simple 、 Easy to use
Oracle ( Oracle products )
- For all mainstream platforms
- Security 、 perfect , The operation is complicated
DB2 (IBM The products of the company )
- For all mainstream platforms
- Sky type 、 Security 、 perfect
MySQL( Oracle buys )
- free 、 Open source 、 Small volume
Introduction to relational database
A relational database system is a database system based on a relational model
The data structure of relational model uses two-dimensional data table which is easy to understand
- Each line is called a record , Information used to describe an object
- Each column is called a field , Used to describe an attribute of an object
The relational model can be simply “ Entity - Relationship ”(E-R) It is shown in the figure
E-R The figure contains the entity ( Data objects )、 Three elements of relationship and attribute
relational database : Entity
Also known as instances , Corresponding to... That can be distinguished from other objects in the real world “ event ” Or things "
Such as bank customers 、 Bank accounts, etcrelational database : attribute
A property of an entity , An entity can have multiple properties
Such as “ Bank customers ” Each entity in the entity set has a name 、 address 、 Telephone, etcrelational database : contact
The correspondence between entity sets is called connection , Also known as relationships, such as between bank customers and bank accounts “ savings ” The relationship betweenThe collection of all entities and their relationships constitutes a relational database
The storage structure of relational database is two-dimensional tables in each two-dimensional table
- Each line is called a record , Information used to describe an object
- Each column is called a field , Used to describe an attribute of an object
Application of relational database
Relational database
- Oracle、Mysql
- SQLServer、Sybase
- Informix、access
- DB2、FoxPRO
Applications in life
- 12306 User information system
- Taobao account system
- Website user information system
Introduction to non relational database
- Non relational databases are also called NoSQL (Not Only SQL)
- Storing data is not based on a relational model , No fixed table format is required
- Advantages of non relational database
- Database can be read and written with high concurrency
- Efficient storage and access to massive data
- Database has high scalability and high availability
- Common non relational databases
- Redis
- mongoDB
- etc.
MySQL Database introduction
MySQL
- A popular open source relational database
- Oracle Our products
- comply with GPL agreement , It can be used and modified free of charge
- characteristic
- Performance is remarkable 、 Stable service
- Open source 、 No copyright restrictions 、 The cost is low
- Multithreading 、 Multi user
- be based on C/S( client / The server ) framework
- Safe and reliable
MySQL Installation method
See details before LNMP Medium MySQL install
mysql install
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