mysql慢查询分析

mysql慢查询分析

Posted: 29. 08. 2014 | Author: zdz | Category: mysql

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

将慢查询日志的分析结果可视化
Query-Digest-UI

其实，这是一个非常简单和直接的工具，浏览和统计Mysql慢查询，基于AJAX的Web界面。

配置Query-Digest-UI：

下载：
wget https://nodeload.github.com/kormoc/Query-Digest-UI/zip/master
unzip Query-Digest-UI-master.zip

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-UI

DROP DATABASE IF EXISTS slow_query_log;

CREATE DATABASE slow_query_log;

USE slow_query_log;

– Create the global query review table

CREATE 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 table

CREATE TABLE `global_query_review_history` (

`hostname_max` varchar(64) NOT NULL,

`db_max` varchar(64) 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.git

cd Query-Digest-UI

cp config.php.example config.php

vi 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