MySQL 慢查询日志分析

1. pt-query-digest分析慢查询日志

pt-query-digest --report slow.log

2. 报告最近半个小时的慢查询：

pt-query-digest --report --since 1800s slow.log

3. 报告一个时间段的慢查询：

pt-query-digest --report --since '2013-02-10 21:48:59' --until '2013-02-16 02:33:50' slow.log

4. 报告只含select语句的慢查询:

pt-query-digest --filter '$event->{fingerprint} =~ m/^select/i' slow.log

5. 报告针对某个用户的慢查询:

pt-query-digest --filter '($event->{user} || "") =~ m/^root/i' slow.log

6. 报告所有的全表扫描或full join的慢查询:

pt-query-digest --filter '(($event->{Full_scan} || "") eq "yes") || (($event->{Full_join} || "") eq "yes")' slow.log

更多filter的 事件属性

将慢查询日志的分析结果可视化

使用pt-query-digest分析慢查询日志并将查询分析数据保存到MySQL数据库表中.然后使用 Query-Digest-UI 来展示分析结果.

由于Query-Digest-UI是基于PHP的Web应用程序,因此需要LAMP环境的支持.

查询分析结果可视化步骤如下: 1)创建相关数据库表

-- install.sql-- Create the database needed for the Query-Digest-UIDROP DATABASE IF EXISTS slow_query_log;CREATE DATABASE slow_query_log;USE slow_query_log;-- Create the global query review tableCREATE TABLE `global_query_review` (`checksum` bigint(20) unsigned NOT NULL,`fingerprint` text NOT NULL,`sample` longtext NOT NULL,`first_seen` datetime DEFAULT NULL,`last_seen` datetime DEFAULT NULL,`reviewed_by` varchar(20) DEFAULT NULL,`reviewed_on` datetime DEFAULT NULL,`comments` text,`reviewed_status` varchar(24) DEFAULT NULL,PRIMARY KEY (`checksum`)) ENGINE=InnoDB DEFAULT CHARSET=utf8;-- Create the historical query review tableCREATE TABLE `global_query_review_history` (`hostname_max` varchar() NOT NULL,`db_max` varchar() DEFAULT NULL,`checksum` bigint(20) unsigned NOT NULL,`sample` longtext NOT NULL,`ts_min` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',`ts_max` datetime NOT NULL DEFAULT '0000-00-00 00:00:00',`ts_cnt` float DEFAULT NULL,`Query_time_sum` float DEFAULT NULL,`Query_time_min` float DEFAULT NULL,`Query_time_max` float DEFAULT NULL,`Query_time_pct_95` float DEFAULT NULL,`Query_time_stddev` float DEFAULT NULL,`Query_time_median` float DEFAULT NULL,`Lock_time_sum` float DEFAULT NULL,`Lock_time_min` float DEFAULT NULL,`Lock_time_max` float DEFAULT NULL,`Lock_time_pct_95` float DEFAULT NULL,`Lock_time_stddev` float DEFAULT NULL,`Lock_time_median` float DEFAULT NULL,`Rows_sent_sum` float DEFAULT NULL,`Rows_sent_min` float DEFAULT NULL,`Rows_sent_max` float DEFAULT NULL,`Rows_sent_pct_95` float DEFAULT NULL,`Rows_sent_stddev` float DEFAULT NULL,`Rows_sent_median` float DEFAULT NULL,`Rows_examined_sum` float DEFAULT NULL,`Rows_examined_min` float DEFAULT NULL,`Rows_examined_max` float DEFAULT NULL,`Rows_examined_pct_95` float DEFAULT NULL,`Rows_examined_stddev` float DEFAULT NULL,`Rows_examined_median` float DEFAULT NULL,`Rows_affected_sum` float DEFAULT NULL,`Rows_affected_min` float DEFAULT NULL,`Rows_affected_max` float DEFAULT NULL,`Rows_affected_pct_95` float DEFAULT NULL,`Rows_affected_stddev` float DEFAULT NULL,`Rows_affected_median` float DEFAULT NULL,`Rows_read_sum` float DEFAULT NULL,`Rows_read_min` float DEFAULT NULL,`Rows_read_max` float DEFAULT NULL,`Rows_read_pct_95` float DEFAULT NULL,`Rows_read_stddev` float DEFAULT NULL,`Rows_read_median` float DEFAULT NULL,`Merge_passes_sum` float DEFAULT NULL,`Merge_passes_min` float DEFAULT NULL,`Merge_passes_max` float DEFAULT NULL,`Merge_passes_pct_95` float DEFAULT NULL,`Merge_passes_stddev` float DEFAULT NULL,`Merge_passes_median` float DEFAULT NULL,`InnoDB_IO_r_ops_min` float DEFAULT NULL,`InnoDB_IO_r_ops_max` float DEFAULT NULL,`InnoDB_IO_r_ops_pct_95` float DEFAULT NULL,`InnoDB_IO_r_bytes_pct_95` float DEFAULT NULL,`InnoDB_IO_r_bytes_stddev` float DEFAULT NULL,`InnoDB_IO_r_bytes_median` float DEFAULT NULL,`InnoDB_IO_r_wait_min` float DEFAULT NULL,`InnoDB_IO_r_wait_max` float DEFAULT NULL,`InnoDB_IO_r_wait_pct_95` float DEFAULT NULL,`InnoDB_IO_r_ops_stddev` float DEFAULT NULL,`InnoDB_IO_r_ops_median` float DEFAULT NULL,`InnoDB_IO_r_bytes_min` float DEFAULT NULL,`InnoDB_IO_r_bytes_max` float DEFAULT NULL,`InnoDB_IO_r_wait_stddev` float DEFAULT NULL,`InnoDB_IO_r_wait_median` float DEFAULT NULL,`InnoDB_rec_lock_wait_min` float DEFAULT NULL,`InnoDB_rec_lock_wait_max` float DEFAULT NULL,`InnoDB_rec_lock_wait_pct_95` float DEFAULT NULL,`InnoDB_rec_lock_wait_stddev` float DEFAULT NULL,`InnoDB_rec_lock_wait_median` float DEFAULT NULL,`InnoDB_queue_wait_min` float DEFAULT NULL,`InnoDB_queue_wait_max` float DEFAULT NULL,`InnoDB_queue_wait_pct_95` float DEFAULT NULL,`InnoDB_queue_wait_stddev` float DEFAULT NULL,`InnoDB_queue_wait_median` float DEFAULT NULL,`InnoDB_pages_distinct_min` float DEFAULT NULL,`InnoDB_pages_distinct_max` float DEFAULT NULL,`InnoDB_pages_distinct_pct_95` float DEFAULT NULL,`InnoDB_pages_distinct_stddev` float DEFAULT NULL,`InnoDB_pages_distinct_median` float DEFAULT NULL,`QC_Hit_cnt` float DEFAULT NULL,`QC_Hit_sum` float DEFAULT NULL,`Full_scan_cnt` float DEFAULT NULL,`Full_scan_sum` float DEFAULT NULL,`Full_join_cnt` float DEFAULT NULL,`Full_join_sum` float DEFAULT NULL,`Tmp_table_cnt` float DEFAULT NULL,`Tmp_table_sum` float DEFAULT NULL,`Filesort_cnt` float DEFAULT NULL,`Filesort_sum` float DEFAULT NULL,`Tmp_table_on_disk_cnt` float DEFAULT NULL,`Tmp_table_on_disk_sum` float DEFAULT NULL,`Filesort_on_disk_cnt` float DEFAULT NULL,`Filesort_on_disk_sum` float DEFAULT NULL,`Bytes_sum` float DEFAULT NULL,`Bytes_min` float DEFAULT NULL,`Bytes_max` float DEFAULT NULL,`Bytes_pct_95` float DEFAULT NULL,`Bytes_stddev` float DEFAULT NULL,`Bytes_median` float DEFAULT NULL,UNIQUE KEY `hostname_max` (`hostname_max`,`checksum`,`ts_min`,`ts_max`),KEY `ts_min` (`ts_min`),KEY `checksum` (`checksum`)) ENGINE=InnoDB DEFAULT CHARSET=utf8;

2) 创建数据库账号

$ mysql -uroot -p -h 192.168.1.190 < install.sql$ mysql -uroot -p -h 192.168.1.190 -e "grant ALL ON slow_query_log.* to 'slowlog'@'%' IDENTIFIED BY '123456';"

3) 配置Query-Digest-UI

git clone https://github.com/kormoc/Query-Digest-UI.gitcd Query-Digest-UIcp config.php.example config.phpvi config.php$reviewhost = array(// Replace hostname and database in this setting// use host=hostname;port=portnum if not the default port	'dsn'	 => 'mysql:host=192.168.1.190;port=3306;dbname=slow_query_log',	'user'	=> 'slowlog',	'password'	=> '123456',// See http://www.percona.com/doc/percona-toolkit/2.1/pt-query-digest.html#cmdoption-pt-query-digest--review	'review_table'=> 'global_query_review',// This table is optional. You don't need it, but you lose detailed stats// Set to a blank string to disable// See http://www.percona.com/doc/percona-toolkit/2.1/pt-query-digest.html#cmdoption-pt-query-digest--review-history	'history_table' => 'global_query_review_history',);

4)使用pt-query-digest分析日志并将分析结果导入数据库

pt-query-digest --user=slowlog --password=123456 --review h=192.168.1.190,D=slow_query_log,t=global_query_review --review-history h=192.168.1.190,D=slow_query_log,t=global_query_review_history --no-report --limit=0% --filter=" /$event->{Bytes} = length(/$event->{arg}) and /$event->{hostname}=/"$HOSTNAME/"" /usr/local/mysql/data/slow.log

5)访问web界面查看可视化结果

转自：http://www.zrwm.com/?p=2668

Q群：39514058