mysql5.7忘記root密碼，mariadb，受權遠程訪問

受權遠程訪問mysql超級用戶遠程訪問：

mysql -u root -p
#輸入密碼，進入mysql客戶
use mysql
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'root password...' WITH GRANT OPTION;
FLUSH PRIVILEGES; #更新權限

忘記重設mysql 的root密碼：

vim /etc/my.cnf
[mysqld] 
datadir=/var/lib/mysql  
socket=/var/lib/mysql/mysql.sock  
skip-grant-tables #添加這行
＃保存退出

systemctl restart mysqld
mysql -u root
use mysql;
#MySQL 5.7.6 以及最新版本：
update user set authentication_string=PASSWORD('new password') where User='root';
#MySQL 5.7.5 或更早以前的版本:
update user set password=PASSWORD('new password') where User='root';

Mysql5.7的運行SQL語句文件的時候會報下面錯誤：

 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated c

解決方法：

在 /etc/my.cnf 文件里加上以下：
sql_mode='NO_ENGINE_SUBSTITUTION'
重啓Mysql服務

mariadb安裝：

mariadb安裝：
yum install mariadb-server mariadb

mariadb數據庫的相關命令是：
systemctl start mariadb  #啓動MariaDB
systemctl stop mariadb  #中止MariaDB
systemctl restart mariadb  #重啓MariaDB
systemctl enable mariadb  #設置開機啓動

初始化：
mysql_secure_installation

mariadb配置容許遠程訪問方式：
mysql -u root -p
GRANT ALL PRIVILEGES ON *.* TO 'root'@'%'IDENTIFIED BY '20161130' WITH GRANT OPTION;
flush privileges;