1、Found option without preceding group in config file

D:\mysql-8.0.17\bin>mysqld --initialize --console

mysqld: [ERROR] Found option without preceding group in config file D:\mysql-8.0.17\my.ini at line 1.

mysqld: [ERROR] Fatal error in defaults handling. Program aborted!

原因：my.ini文件格式是utf-8

解决办法：my.ini文件保存为ANSI格式文件

2、Install/Remove of the Service Denied!

解决办法：打开cmd.exe程序的时候选择“用管理员身份打开”。

3、MySQL8.0，Navicat连接不上，报错1251

原因是MySQL8.0版本的加密方式和MySQL5.0的不一样，连接会报错。

解决方法

C:\Windows\system32>mysql -uroot -p

Enter password: ******

Welcome to the MySQL monitor. Commands end with ; or\g.

Your MySQL connection id is 18Server version: 8.0.11 MySQL Community Server -GPL

Copyright (c) 2000, 2018, Oracle and/or its affiliates. Allrights reserved.

Oracle is a registered trademark of Oracle Corporation and/orits

affiliates. Other names may be trademarks oftheir respective

owners.

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

mysql>

mysql> use mysql;

Database changed

mysql> ALTER USER 'root'@'localhost' IDENTIFIED BY 'password' PASSWORD EXPIRE NEVER;

Query OK, 0 rows affected (0.10 sec)

mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'password';

Query OK, 0 rows affected (0.35 sec)

mysql> FLUSH PRIVILEGES;

Query OK, 0 rows affected (0.28 sec)