1、Mysql批量导入sql
（1）选择数据库
mysql>use abc;
（2）设置数据库编码
mysql>set names utf8;
（3）导入数据（注意sql文件的路径）
mysql>source /home/abc/abc.sql;
2、Mysql导出为sql（导出数据和表结构）
mysqldump -u用户名 -p 数据库名 > 数据库名.sql
#/usr/local/mysql/bin/mysqldump -uroot -p abc > abc.sql
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敲回车后会提示输入密码
或者通过navicat工具导出。
3、导出结果数据
select * from ly_info where enckeyword = "0" into outfile '/tmp/ly_insert.txt';
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将结果转为sql语句，参考：
http://blog.csdn.net/laoyang360/article/details/53236018
4、Mysql ut8格式修改，目的：防止出现乱码。
最简单的完美修改方法，修改mysql的my.cnf文件中的字符集键值（注意配置的字段细节）：
1）、在[client]字段里加入default-character-set=utf8，
如下：
[client]
port = 3306
socket = /var/lib/mysql/mysql.sock
default-character-set=utf8
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2）、在[mysqld]字段里加入character-set-server=utf8，
如下：
[mysqld]
port = 3306
socket = /var/lib/mysql/mysql.sock
character-set-server=utf8
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3）、在[mysql]字段里加入default-character-set=utf8，
如下：
[mysql]
no-auto-rehash
default-character-set=utf8
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验证方式如下：
使用SHOW VARIABLES LIKE ‘character%’;查看，发现数据库编码全已改成utf8。
+--------------------------+----------------------------+
| Variable_name | Value |
+--------------------------+----------------------------+
| character_set_client | utf8 |
| character_set_connection | utf8 |
| character_set_database | utf8 |
| character_set_filesystem | binary |
| character_set_results | utf8 |
| character_set_server | utf8 |
| character_set_system | utf8 |
| character_sets_dir | /usr/share/mysql/charsets/ |
+--------------------------+----------------------------+
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4）如果上面的都修改了还乱码，那剩下问题就一定在connection连接层上。
解决方法是在发送查询前执行一下下面这句（直接写在SQL文件的最前面）：
SET NAMES ‘utf8’;
它相当于下面的三句指令：
SET character_set_client = utf8;
SET character_set_results = utf8;
SET character_set_connection = utf8;
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5、mysql远程windows授权命令
错误：Access denied for user ‘root@IP’ (using password: YES)
mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'password@!' WITH GRANT OPTION;
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6、查询、更新操作
SELECT count(1) AS num, 'qd_last' AS info FROM `qd_info` WHERE enckeyword = "0";
update ya_info t1 , ls_info t2 set t1.id_new = t2.id_new where t1._id = t2._id;
alter table qd_info add `word` varchar(256) NOT NULL DEFAULT '0', add `update_time` timestamp NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP;
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7、查看死锁表死锁
show processlist ;
mysql> show processlist;
+--------+------+--------------------+------+---------+------+----------+------------------------------------------------------------------------------------------------------+
| Id | User | Host | db | Command | Time | State | Info |
+--------+------+--------------------+------+---------+------+----------+------------------------------------------------------------------------------------------------------+
| 219733 | root | 10.200.1.137:38012 | test | Sleep | 1659 | | NULL |
| 219749 | root | 10.200.1.137:38071 | test | Query | 85 | Locked | SELECT count(1) AS num, 't_last' AS info FROM `com_info` WHERE enckeyword = "0"
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解决方法： 关闭用不到的连接
mysql> kill 219733 ;
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未完待续
