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HomeDatabaseMysql Tutorialmysql慢查询分析centos下mysqlsla的安装与使用

yum -yinstall perl perl-DBI perl-CPAN wget http://hackmysql.com/scripts/mysqlsla-2.03.tar.gz tar zxvf mysqlsla-2.03.tar.gz cd mysqlsla-2.03 perl Makefile.PL make make install mysqlsla -lt slow /var/mysql/log/mysql-slow.log 统计参数说明? qu

yum -y install perl perl-DBI perl-CPAN

wget http://hackmysql.com/scripts/mysqlsla-2.03.tar.gz

tar zxvf mysqlsla-2.03.tar.gz

cd mysqlsla-2.03

perl Makefile.PL

make

make install

mysqlsla -lt slow /var/mysql/log/mysql-slow.log

统计参数说明?

queries total: 总查询次数  

unique:去重后的sql数量  

sorted by : 输出报表的内容排序 最重大的慢sql统计信息, 包括 平均执行时间, 等待锁时间, 结果行的总数, 扫描的行总数.  

Count: sql的执行次数及占总的slow log数量的百分比.  

Time: 执行时间, 包括总时间, 平均时间, 最小, 最大时间, 时间占到总慢sql时间的百分比.  

95% of Time: 去除最快和最慢的sql, 覆盖率占95%的sql的执行时间.  

Lock Time: 等待锁的时间.  

95% of Lock: 95%的慢sql等待锁时间.  

Rows sent: 结果行统计数量, 包括平均, 最小, 最大数量.  

Rows examined: 扫描的行数量.  

Database: 属于哪个数据库. 

Users: 哪个用户,哪个IP, 占到所有用户执行的sql百分比. 

Query abstract: 抽象化的sql语句. 

Query sample: sql语句.

使用参数说明

–log-type (-lt) type logs:

通过这个参数来制定log的类型,主要有slow, general, binary, msl, udl,分析slow log时通过制定为slow.

–sort:

 制定使用什么参数来对分析结果进行排序,默认是按照t_sum来进行排序。

 t_sum按总时间排序, c_sum按总次数排序

–top:

显示sql的数量,默认是10,表示取按规则排序的前多少条

–statement-filter (-sf) [+-][TYPE]:

过滤sql语句的类型,比如select、update、drop. [TYPE]有SELECT, CREATE, DROP, UPDATE, INSERT,例如”+SELECT,INSERT”,不出现的默认是-,即不包括。

–databases db:

要处理哪个库的日志。

使用举例

将慢日志mysqlslow.log中执行时间最长的10条sql显示并写到sql_10.log中。

mysqlsla -lt slow  -sf “+select” -top 10 mysqlslow.log >sql_10.log

将慢日志mysqlslow.log中数据库为mydb的所有select和update的慢sql,显示并将查询次数最多的100条写到sql_su100.sql中。

mysqlsla -lt slow  -sf “+select,update” -top 100 -sort c_sum -db mydb mysqlslow.log >sql_su100.log

 

来自为知笔记(Wiz)Time=2013-04-23 15:13:27

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