[mysqld]
# 设置3306端口
port=3306
# 设置mysql的安装目录
basedir=D:\\MySQL\\mysql-8.0.20-winx64 # 此处为mysql的解压缩路径
# 设置mysql数据库的数据的存放目录
datadir=D:\\MySQL\\mysql-8.0.20-winx64\\Data # 此处同上，先不要在路径中创建Data目录，后面初始化时会自动生成
# 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
# 默认使用“mysql_native_password”插件认证
default_authentication_plugin=mysql_native_password
[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

Microsoft Windows [Version 10.0.18363.815]
(c) 2019 Microsoft Corporation。保留所有权利。

C:\Windows\system32>D:

D:\>cd MySQL

D:\MySQL>cd mysql-8.0.20-winx64

D:\MySQL\mysql-8.0.20-winx64>cd bin

D:\MySQL\mysql-8.0.20-winx64\bin>

D:\MySQL\mysql-8.0.20-winx64\bin>mysqld --initialize --console
2020-05-10T11:26:21.895908Z 0 [System] [MY-013169] [Server] D:\MySQL\mysql-8.0.20-winx64\bin\mysqld.exe (mysqld 8.0.20) initializing of server in progress as process 9764
2020-05-10T11:26:21.897278Z 0 [Warning] [MY-013242] [Server] --character-set-server: 'utf8' is currently an alias for the character set UTF8MB3, but will be an alias for UTF8MB4 in a future release. 
Please consider using UTF8MB4 in order to be unambiguous.
2020-05-10T11:26:21.915225Z 1 [System] [MY-013576] [InnoDB] InnoDB initialization has started.
2020-05-10T11:26:22.619057Z 1 [System] [MY-013577] [InnoDB] InnoDB initialization has ended.
2020-05-10T11:26:24.265774Z 6 [Note] [MY-010454] [Server] A temporary password is generated for root@localhost: 9Zh31zk-@mof

D:\MySQL\mysql-8.0.20-winx64\bin>mysqld --install
Service successfully installed.

D:\MySQL\mysql-8.0.20-winx64\bin>net start mysql
The MySQL service is starting.
The MySQL service was started successfully.

D:\MySQL\mysql-8.0.20-winx64\bin>mysql -u root -p
Enter password: ************
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 8
Server version: 8.0.20

Copyright (c) 2000, 2020, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY '自己定义的密码;
Query OK, 0 rows affected (0.02 sec)

mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| sys |
+--------------------+
4 rows in set (0.01 sec)