mysql性能监控工具Innotop简介及配置
1.innotop安装 参考官网:http://innotop.googlecode.com/svn/html/installing.html # wget http://innotop.googlecode.com/files/innotop-1.9.0.tar.gz# tar -zxvf innotop-1.9.0.tar.gz # cd innotop-1.9.0 安装INNOTOP工具非常简单,其是由PERL写的,当然
1.innotop安装
参考官网:http://innotop.googlecode.com/svn/html/installing.html
# wget http://innotop.googlecode.com/files/innotop-1.9.0.tar.gz # tar -zxvf innotop-1.9.0.tar.gz # cd innotop-1.9.0
安装INNOTOP工具非常简单,其是由PERL写的,当然需要PERL环境和相关的工具包。在安装之前先要确定你的系统安装了Time::HiRes,Term::ReadKey,DBI,DBD::mysql这四个包
# perl -MCPAN -eshell CPAN> install Time::HiRes CPAN> install Term::ReadKey CPAN> install DBI CPAN> install DBD::mysql
在解压缩后的源码路径下有安装帮助文件,如下:
# perl Makefile.PL
如果没有报错,然后,使用
# make install
这样就安装 innotop,安装之后系统就会多出一个命令,innotop
得到帮助
# innptop --help
参考官网:http://innotop.googlecode.com/svn/html/manual.html
Innotop详解--非常详细:http://wenku.baidu.com/link?url=0cvUfYA5gwKfwvoo1gGPkr9NfK1eZ5UHa3gAhXB-pwlOLQDyH_Y_BN8q5kfIi89Rz_9eGwjJlWmIQBSZ4hOgg0A-w1nGVnbMbrlQwmxGWz_
其中在QUERY LIST中有个SLOW参数,该参数可以在/etc/my.cnf的配置文件中配置使用
它能记录下所有执行超过long_query_time时间的SQL语句, 帮你找到执行慢的SQL, 方便我们对这些SQL进行优化。
-----如何开启mysql慢查询-----
1.首先,进入mysql,输入命令 show variables like '%quer%';
你会看到其中log_slow_queries 的状态为OFF;long_query_time 为10;
2.编辑/etc/my.cnf文件
在[mysqld]下面添加两行:
log-slow-queries = /var/lib/mysql/mysql-slow.log long_query_time = 3
log-slow-queries为日志存放目录;long_query_time为最大查询秒数(按自己需求设置)。
3.重启服务使配置生效
/etc/init.d/mysqld restart
重新进入数据库查询log_slow_queries状态为ON。

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