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 18 Server version: 8.0.11 MySQL Community Server - GPL Copyright (c) 2000, 2018, 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>
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)