Windows 10 install MySQL8 record
Remember that before installing, you need to uninstall the previously installed version of MySQL 5.
Otherwise, the installation fails: Go
to the official website to download the installation package.
Download address: https://dev.mysql.com/downloads/mysql/
Ignore account registration or login, download the zip package directly, and unzip it.
D:\mysql-8.0.23-winx64
Create new
my.ini content:
[mysqld]
# 设置3306端口
port=3306
# 设置mysql的安装目录
basedir=D:\\mysql-8.0.23-winx64
# 设置mysql数据库的数据的存放目录
datadir=D:\\mysql-8.0.23-winx64\\data
# 允许最大连接数
max_connections=200
# 允许连接失败的次数。这是为了防止有人从该主机试图攻击数据库系统
max_connect_errors=10
# 服务端使用的字符集默认为UTF8
character-set-server=utf8
# 创建新表时将使用的默认存储引擎
default-storage-engine=INNODB
[mysql]
# 设置mysql客户端默认字符集
default-character-set=utf8
[client]
# 设置mysql客户端连接服务端时默认使用的端口
port=3306
default-character-set=utf8
Configure the system environment
MYSQL_HOME
Add %MYSQL_HOME%\bin to the path
5: As an administrator, open the cmd window and jump the path to E:\mysql-8.0.11-winx64\bin
Initialize the command mysqld --initialize --user=mysql --console
enter mysqld -install to add services
Enter net start mysql to start the service
Enter mysql -u root -p to log in to the database. At this time, you are prompted for a password, and then log in with your above password.
Modify the password statement: ALTER USER root@localhost IDENTIFIED BY '123456'; Modify the password: 123456
CentOS 8 install MySQL8 record
First, check if MySQL is already installed:
yum list installed mysql
or
rpm -qa | grep mysql
If it is already installed, consider uninstalling. Before uninstalling, turn off the mysql service, and then use the command:
rpm -ev --nodeps mysql-errmsg-8.0.21-1.module_el8.2.0+493+63b41e36.x86_64 mysql-8.0.21-1.module_el8.2.0+493+63b41e36.x86_64 mysql-server-8.0.21-1.module_el8.2.0+493+63b41e36.x86_64 mysql80-community-release-el8-1.noarch mysql-common-8.0.21-1.module_el8.2.0+493+63b41e36.x86_64
Verify uninstall:rpm -qa | grep mysql
Install Yum Repository:
wget https://repo.mysql.com//mysql80-community-release-el8-1.noarch.rpm
Use rpm to install MySQL:
rpm -ivh mysql80-community-release-el8-1.noarch.rpm
Use yum to install mysql service:
yum install mysql-server
Set boot up:
systemctl enable mysqld.service
Created symlink /etc/systemd/system/multi-user.target.wants/mysqld.service → /usr/lib/systemd/system/mysqld.service.
systemctl enable [email protected]
Created symlink /etc/systemd/system/multi-user.target.wants/[email protected] → /usr/lib/systemd/system/[email protected].
Question:
What is the difference between mysqld.service and [email protected]?
Start the service:
systemctl start mysqld.service
Check whether to start the MySQL service
ps -ef|grep mysql
Check whether it is set to start the MySQL service at boot:
systemctl list-unit-files|grep mysqld
If you do not execute:, the systemctl enable [email protected]output will be:
[root@centos170 ~]# systemctl list-unit-files|grep mysqld
mysqld.service enabled
[email protected] disabled
Enter mysql, you can enter the command line, query version:
select version();
get: 8.0.21
View all default databases:
show databases;
output:
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
Note: For most statements, you need to enter a terminating semicolon ;.
As mentioned above, you mysqlcan enter the command line client directly by using it. In addition, you mysql -uroot -pcan enter the mysql client directly by typing and pressing Enter, that is, the root user does not have a password! ! !
However, the local client using visualization tools DataGrip connection for easy subsequent data query and display, but the connection fails, the error message: SQLException: null, message from server: "Host 'XXX' is not allowed to connect.
Reference
This exception is that the database only allows localhost or 127.0.0.1 to be accessed, and remote access is not allowed.
Switch DB: use mysql
view user and corresponding host information:
select user,host from user;
+------------------+-----------+
| user | host |
+------------------+-----------+
| mysql.infoschema | localhost |
| mysql.session | localhost |
| mysql.sys | localhost |
| root | localhost |
+------------------+-----------+
It can be seen that the root user only allows host access to localhost, so it needs to be updated: Take update user set host='%' where user='root';
effect:FLUSH PRIVILEGES;
You must enter the User user name and cannot be empty.
CentOS 8 does not need to enter the user name and password to connect to mysql, or enter root and an empty password.
https://www.cnblogs.com/weixiaofantasy/p/12667912.html
Incorrect password: The
javax.net.ssl.SSLHandshakeException: Received fatal alert: protocol_version.
user name and password must be entered for local connection. Connect to mysql on that machine, no need!
Set username and password:
use mysql;
ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '123456';
FLUSH PRIVILEGES;
Before MySQL 8.04, execute: SET PASSWORD=PASSWORD('[new password]'); But starting from MySQL 8.0.4, this default is not working. Because before, the MySQL password authentication plug-in was "mysql_native_password", but now it uses "caching_sha2_password".
For CentOS8, there is no password to install mysql8 from the default source, you can directly enter mysql for use
mysql -uroot -pxxx
directly run the error:
mysql: [Warning] Using a password on the command line interface can be insecure.
ERROR 1045 (28000): Access denied for user'root'@'localhost' (using password: YES)
mysql -uroot -p
and then enter the password;