27 使用MySQLadmin 关闭数据库
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mysqladmin -uroot -poldboy123 shutdown
ps -ef |grep mysql
28 mysql忘记密码重新修改密码过程：
mysql> mysqld_safe --skip-grant-tables --user=mysql --defaults-file=/data/3306/my.cnf >/dev/null &
-> mysqld_safe --skip-grant-tables --user=mysql >/dev/null &
-> update mysql.user set password=password("oldboy111") where user='root' and host='localhost';
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'mysqld_safe --skip-grant-tables --user=mysql --defaults-file=/data/3306/my.cnf >' at line 1
mysql> update mysql.user set password=password("oldboy111") where user='root' and host='localhost';
Query OK, 1 row affected (0.35 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> Terminated
在此 ，重新开启一个窗口杀掉mysql 注意！千万不要用kill-9 粗暴的杀死mysql，这样会导致数据库丢数据后果将非常严重
ill mysql
[root@root ~]# pkill mysql
[root@root ~]# pkill mysql
[root@root ~]# pkill mysql
[root@root ~]# pkill mysql
[root@root ~]# pkill mysql
[root@root ~]# pkill mysql
[root@root ~]# pkill mysql
[root@root ~]# /etc/init.d/mysqld start
Starting MySQL.... SUCCESS!
[root@root ~]# ps -ef | grep mysql
root 10974 1 0 18:39 pts/2 00:00:00 /bin/sh /application/mysql/bin/mysqld_safe --datadir=/application/mysql/data --pid-file=/application/mysql/data/root.pid
mysql 11148 10974 3 18:39 pts/2 00:00:00 /application/mysql/bin/mysqld --basedir=/application/mysql --datadir=/application/mysql/data --plugin-dir=/application/mysql/lib/plugin --user=mysql --log-error=/application/mysql/data/root.err --pid-file=/application/mysql/data/root.pid
root 11181 10136 0 18:39 pts/2 00:00:00 grep mysql
[root@root ~]# mysql -uroot -poldboy111
Warning: Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.6.34-log MySQL Community Server (GPL)
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> \q
Bye
[root@root ~]# mysql -uroot -poldboy111
Warning: Using a password on the command line interface can be insecure.
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 6
Server version: 5.6.34-log MySQL Community Server (GPL)
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql>