mysql root 密碼更改
如果忘記了 MySQL 的 root 密碼，可以用以下方法重新設定：
1. 關閉 MySQL 伺服器。
/etc/rc.d/init.d/mysqld stop
2. 用以下指令啟動 MySQL，以跳過檢查權限的資料表
mysqld_safe --skip-grant-tables &
(顯示訊息 nohup: ignoring input and redirecting stderr to stdout
Starting mysqld daemon with databases from /var/lib/mysql 直接按Enter)
3. 現在己經可以用空密碼進入 MySQL
mysql -u root
4. 進入 MySQL 後執行以下指令更改 mysql root 密碼：
mysql> update mysql.user set password=PASSWORD(」new_password」) where User=』root';
mysql> flush privileges;
mysql> quit
5. 最後只需重新啟動 MySQL，便可以用新設定的密碼進入了。
參考自:http://www.cosa.org.tw/forum/index.php?topic=73.0
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