mysql8数据库修改root密码

# 修改密码安全度检测机制
set global validate_password.policy=0;
set global validate_password.length=4;

# 修改root密码
alter user 'root'@'localhost' identified by 'newpassword';
alter user 'root'@'%' identified by 'newpassword';

# 生效
flush privileges;

重启MySQL