1. Database Management System
Database management system DBMS is a large-scale software that manipulates and manages databases, and is used to establish, use and maintain databases. Database management systems are divided into RDBMS and NoSQL (Not only SQL).
- The RDBMS
relational database management system is more suitable for data with high security requirements and data with more complex relationships. Common RDBMS are MySQL, Oracle, MSSQL.- NoSQL
non-relational database is suitable for high-performance access to data. It is generally used in conjunction with RDBMS. For big data processing and analysis, distributed architecture is better.
Common NoSQL: key-value storage Redis and document storage MongoDB
2. Introduction to MySQL
MySQL is a small and medium-sized relational database management system suitable for all platforms. It is open source software with fast version updates, excellent performance and low price. The advantages of MySQL database are as follows:
- Can handle large data with tens of millions of records
- Support common SQL statement specifications
- Portable row height, simple and compact installation
- Good operating efficiency, network support with rich information
- Simple debugging, management and optimization (compared to other large databases)
The commonly used MySQL versions are:
- MySQL5.6 ： 5.6.34 5.6.36 5.6.38 5.6.40
- MySQL5.7 ： 5.7.18 5.7.20 5.7.24
Three, MySQL installation
Remove mariadb environment
rpm -qa |grep mariadb
yum remove mariadb-libs-5.5.60-1.el7_5.x86_64 -y
Unzip software
tar xf mysql-5.7.20-linux-glibc2.12-x86_64.tar.gz
mv mysql-5.7.20-linux-glibc2.12-x86_64 /application/mysql
Set environment variables
export PATH=$PATH:/application/mysql/bin
source /etc/profile
Create mysql user
useradd -M -s /sbin/nologin mysql
Create data storage directory and log storage directory
mkdir -p /data/mysql/data
mkdir -p /data/mysql/log
mkdir -p /data/mysql/socket
Create mysql.log, mysql-bin and mysql.sock
touch /data/mysql/log/{mysql.log,mysql-bin}
touch /data/mysql/socket/mysql.sock
Directory authorization
chown -R mysql.mysql /application/mysql
chown -R mysql.mysql /data/mysql
Edit configuration file
[mysqld]
user=mysql
basedir=/application/mysql
datadir=/data/mysql/data
socket=/data/mysql/socket/mysql.sock
log_error=/data/mysql/log/mysql.log
log_bin=/data/mysql/log/mysql-bin
server_id=6
port=3306
[mysql]
socket=/data/mysql/socket/mysql.sock
Start the database
/application/mysql/support-files/mysql.server start
Startup script
vim /etc/systemd/system/mysqld.service
[Unit]
Description=MySQL Server
Documentation=man:mysqld(8)
Documentation=http://dev.mysql.com/doc/refman/en/using-systemd.html
After=network.target
After=syslog.target
[Install]
WantedBy=multi-user.target
[Service]
User=mysql
Group=mysql
ExecStart=/application/mysql/bin/mysqld --defaults-file=/etc/my.cnf
LimitNOFILE = 5000
Set automatic startup
systemctl enable mysqld.service
Set database password
set PASSWORD = PASSWORD('mysql');
Management authorization
grant all privileges on . to 'root'@'%' identified by 'mysql' with grant option;
Four, client login
1. sqlyog
2. navicat
