使用mysqlsla分析mysql日志_MySQL
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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 http://hackmysql.com/scripts/mysqlsla-2.03.tar.gztar 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.log2. 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、FAQ1. 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. 作者 飞鸿无痕 bitsCN.com
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