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)