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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MySQL partitioning improves performance and simplifies maintenance. 1) Divide large tables into small pieces by specific criteria (such as date ranges), 2) physically divide data into independent files, 3) MySQL can focus on related partitions when querying, 4) Query optimizer can skip unrelated partitions, 5) Choosing the right partition strategy and maintaining it regularly is key.

How to grant and revoke permissions in MySQL? 1. Use the GRANT statement to grant permissions, such as GRANTALLPRIVILEGESONdatabase_name.TO'username'@'host'; 2. Use the REVOKE statement to revoke permissions, such as REVOKEALLPRIVILEGESONdatabase_name.FROM'username'@'host' to ensure timely communication of permission changes.

InnoDB is suitable for applications that require transaction support and high concurrency, while MyISAM is suitable for applications that require more reads and less writes. 1.InnoDB supports transaction and bank-level locks, suitable for e-commerce and banking systems. 2.MyISAM provides fast read and indexing, suitable for blogging and content management systems.

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MySQLoffersvariousstorageengines,eachsuitedfordifferentusecases:1)InnoDBisidealforapplicationsneedingACIDcomplianceandhighconcurrency,supportingtransactionsandforeignkeys.2)MyISAMisbestforread-heavyworkloads,lackingtransactionsupport.3)Memoryengineis

Common security vulnerabilities in MySQL include SQL injection, weak passwords, improper permission configuration, and unupdated software. 1. SQL injection can be prevented by using preprocessing statements. 2. Weak passwords can be avoided by forcibly using strong password strategies. 3. Improper permission configuration can be resolved through regular review and adjustment of user permissions. 4. Unupdated software can be patched by regularly checking and updating the MySQL version.

Identifying slow queries in MySQL can be achieved by enabling slow query logs and setting thresholds. 1. Enable slow query logs and set thresholds. 2. View and analyze slow query log files, and use tools such as mysqldumpslow or pt-query-digest for in-depth analysis. 3. Optimizing slow queries can be achieved through index optimization, query rewriting and avoiding the use of SELECT*.


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