如果有一天你忘記了root的密碼，我們可以利用 --skip-grant-tables這個引數，具體實施如下：
[root@he1 bin]# mysql -uroot -p
enter password:
error 1045 (28000):access denied for user 'root'@'localhost' (using password: yes)
[root@he1 bin]# ps-ef|grep mysql
root 7572 2398 0 00:58 pts/1 00:00:00 /bin/sh ./mysqld_safe--defaults-file=/etc/my.cnf
mysql 8199 7572 0 00:58 pts/1 00:00:00 /usr/local/mysql/bin/mysqld--defaults-file=/etc/my.cnf --basedir=/usr/local/mysql --datadir=/data/mysql--plugin-dir=/usr/local/mysql/lib/plugin --user=mysql--log-error=/data/mysql/error.log --open-files-limit=3072--pid-file=/data/mysql/he1.pid --socket=/data/mysql.sock --port=3306
root 8230 2398 0 00:59 pts/1 00:00:00 grep mysql
[root@he1 bin]# kill -9 8199 7572
[root@he1 bin]# ps-ef|grep mysql
root 8232 2398 0 00:59 pts/1 00:00:00 grep mysql
[1]+ killed ./mysqld_safe--defaults-file=/etc/my.cnf
[root@he1 bin]# ps-ef|grep mysql
root 8234 2398 0 00:59 pts/1 00:00:00 grep mysql
[root@he1 bin]# ./mysqld_safe --defaults-file=/etc/my.cnf--skip-grant-tables &
[1] 8235
[root@he1 bin]#160317 00:59:43 mysqld_safe logging to '/data/mysql/error.log'.
160317 00:59:43mysqld_safe starting mysqld daemon with databases from /data/mysql
[root@he1 bin]# mysql -uroot
welcome to the mysqlmonitor. commands end with ; or \g.
your mysqlconnection id is 1
server version:5.6.16-log mysql community server (gpl)
oracle is aregistered trademark of oracle corporation and/or its
affiliates. othernames may be trademarks of their respective
owners.
type 'help;' or '\h'for help. type '\c' to clear the current input statement.
mysql> quit
bye[root@he1 bin]#mysql
welcome to the mysqlmonitor. commands end with ; or \g.
your mysqlconnection id is 2
server version:5.6.16-log mysql community server (gpl)
oracle is aregistered trademark of oracle corporation and/or its
affiliates. othernames may be trademarks of their respective
owners.
type 'help;' or '\h'for help. type '\c' to clear the current input statement.
mysql> quit
bye本文中採用kill-9的方式，這種方式不建議在生產庫中使用，生產庫中應採用正常停庫
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