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HomeDatabaseMysql Tutorial使用mysqlsla分析MySQL日志

mysqlsla是hackmysql.com推出的一款MySQL的日志分析工具,可以分析mysql的慢查询日志、分析慢查询非常好用,能针对库分析慢查询语

mysqlsla是hackmysql.com推出的一款MySQL的日志分析工具,可以分析mysql的慢查询日志、分析慢查询非常好用,,能针对库分析慢查询语句的执行频率、扫描的数据量、消耗时间等,而且分析出来以后还有语句范例,比mysqldumpslow好用。

  接下来就来详细介绍一下mysqlsla的使用:

一、mysqlsla的安装

wget

tar zvxf mysqlsla-2.03.tar.gz

cd mysqlsla-2.03 

perl Makefile.PL 

make

make install

二、使用参数说明

1.  --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.

2.  --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

3.  --top:

显示sql的数量,默认是10,表示取按规则排序的前多少条

4.  --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。

5.  --databases db:

要处理哪个库的日志:

三、统计参数说明

1. queries total: 总查询次数 

2. unique:去重后的sql数量 

3. 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. 

4. Count: sql的执行次数及占总的slow log数量的百分比. 

5. 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. 

6. 95% of Time: 去除最快和最慢的sql, 覆盖率占95%的sql的执行时间. 

7. Lock Time: 等待锁的时间. 

8.95% of Lock: 95%的慢sql等待锁时间. 

9.Rows sent: 结果行统计数量, 包括平均, 最小, 最大数量. 

10.Rows examined: 扫描的行数量. 

11.Database: 属于哪个数据库. 

12.Users: 哪个用户,IP, 占到所有用户执行的sql百分比. 

13. Query abstract: 抽象后的sql语句. 

14. Query sample: sql语句.

四、使用范例

1.  统计慢查询文件为dowload_server1-slow.log的所有select的慢查询sql,并显示执行时间最长的10条sql,并写到sql_time.sql中去

mysqlsla -lt slow  -sf "+select" -top 10  dowload_server1-slow.log >test_time.log


2.  统计慢查询文件为dowload_server1-slow.log的数据库为ultraxsmutf8的所有select和update的慢查询sql,并查询次数最多的100条sql,并写到sql_num.sql中去

mysqlsla -lt slow  -sf "+select,update" -top 100 -sort c_sum -db  ultraxsmutf8 dowload_server1-slow.log >num_time.log

五、FAQ

1.  错误:

Can't locate DBI.pm in @INC (@INC contains: /usr/lib/perl5/site_perl/5.8.8/i386-linux-thread-…….

解决办法: perl -MCPAN -e 'install DBI' 或者cpan DBI

2、错误:

Use of uninitialized value in numeric comparison () at /usr/bin/mysqlsla line 2962.

解决办法:当采用-sort t_su就会出现这个错误,默认就是采用时间排序,因此可以去掉

 

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