01.root登录没有权限

• 修改用户权限全为Y

UPDATE user SET select_priv='Y',Insert_priv='Y',Update_priv='Y',Delete_priv='Y',Create_priv='Y',Drop_priv='Y',Reload_priv='Y',File_priv='Y',Grant_priv='Y',References_priv='Y',Index_priv='Y',Alter_priv='Y',Show_db_priv='Y',Super_priv='Y',Create_tmp_table_priv='Y',Lock_tables_priv='Y',Execute_priv='Y',Repl_slave_priv='Y',Repl_client_priv='Y',Create_view_priv='Y',Show_view_priv='Y',Create_routine_priv='Y',Alter_routine_priv='Y',Create_user_priv='Y',Event_priv='Y',Trigger_priv='Y',Create_tablespace_priv='Y' WHERE user='root';

• 刷新权限

MySQL> flush privileges;      # 刷新权限
MySQL> quit              # 退出
systemctl restart MySQL      # 重启服务

02.MySQL 忘记密码

• 1、关闭MySQL服务

# 老版本
sudo /usr/local/MySQL/support-files/MySQL.server stop
# mac新版本
sudo /usr/local/bin/MySQL.server stop

• 2、进入MySQL各种执行文件的 目录

# 新版本: 
cd /usr/local/MySQL/bin
# 老版本: 
cd /usr/local/bin

• 4、重启服务器

sudo ./MySQLd_safe --skip-grant-tables &   # 输入mac 电脑密码

• 5、重开个终端

# 执行然后会提示输入密码，回车就行
MySQL -u root -p

• 6、获取权限

flush privileges;

• 7、设置新密码

ALTER USER ‘root’@‘localhost’ IDENTIFIED WITH caching_sha2_password BY '123456';