對MySQL慢查詢日記停止剖析的根本教程。本站提示廣大學習愛好者：（對MySQL慢查詢日記停止剖析的根本教程）文章只能為提供參考，不一定能成為您想要的結果。以下是對MySQL慢查詢日記停止剖析的根本教程正文
0、起首檢查以後能否開啟慢查詢：
（1）疾速方法，運轉sql語句
show VARIABLES like "%slow%"
（2）直接去my.conf中檢查。
my.conf中的設置裝備擺設(放在[mysqld]下的下方參加)
[mysqld] log-slow-queries = /usr/local/mysql/var/slowquery.log long_query_time = 1 #單元是秒 log-queries-not-using-indexes
應用sql語句來修正：不克不及依照my.conf中的項來修正的。修正經由過程"show VARIABLES like "%slow%" "
語句列出來的變量，運轉以下sql：
set global log_slow_queries = ON; set global slow_query_log = ON; set global long_query_time=0.1; #設置年夜於0.1s的sql語句記載上去
慢查詢日記文件的信息格局：
# Time: 130905 14:15:59 時光是2013年9月5日 14:15:59(後面部門輕易看錯哦,乍看認為是時光戳) # User@Host: root[root] @ [183.239.28.174] 要求mysql辦事器的客戶端ip # Query_time: 0.735883 Lock_time: 0.000078 Rows_sent: 262 Rows_examined: 262 這裡表現履行用時若干秒，0.735883秒，1秒等於1000毫秒
SET timestamp=1378361759; 這今朝我還不曉得干嗎用的
show tables from `test_db`; 這個就是症結信息，指清楚明了其時履行的是這條語句
1、MySQL 慢查詢日記剖析
pt-query-digest剖析慢查詢日記
pt-query-digest –report slow.log
申報比來半個小時的慢查詢：
pt-query-digest –report –since 1800s slow.log
申報一個時光段的慢查詢：
pt-query-digest –report –since ‘2013-02-10 21:48:59′ –until ‘2013-02-16 02:33:50′ slow.log
申報只含select語句的慢查詢:
pt-query-digest –filter ‘$event->{fingerprint} =~ m/^select/i' slow.log
申報針對某個用戶的慢查詢:
pt-query-digest –filter ‘($event->{user} || “”) =~ m/^root/i' slow.log
申報一切的全表掃描或full join的慢查詢:
pt-query-digest –filter ‘(($event->{Full_scan} || “”) eq “yes”) || (($event->{Full_join} || “”) eq “yes”)' slow.log
2、將慢查詢日記的剖析成果可視化
Query-Digest-UI
其實，這是一個異常簡略和直接的對象，閱讀和統計Mysql慢查詢，基於AJAX的Web界面。
設置裝備擺設Query-Digest-UI：
下載：
wget https://nodeload.github.com/kormoc/Query-Digest-UI/zip/master unzip Query-Digest-UI-master.zip
查詢剖析成果可視化步調以下:
（1）創立相干數據庫表
-- 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）創立數據庫賬號
$ 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）設置裝備擺設Query-Digest-UI
修正數據庫銜接設置裝備擺設
cd Query-Digest-UI cp config.php.example config.php vi config.php $reviewhost = array( // WordStr hostname and database in this setting // use host=hostname;port=portnum if not the default port 'dsn' => 'mysql:host=192.168.1.190;port=3306;dbname=slow_query_log', 'user' => 'slowlog', 'password' => '123456', // See http://www.percona.com/doc/percona-toolkit/2.1/pt-query-digest.html#cmdoption-pt-query-digest--review 'review_table' => 'global_query_review', // This table is optional. You don't need it, but you lose detailed stats // Set to a blank string to disable // See http://www.percona.com/doc/percona-toolkit/2.1/pt-query-digest.html#cmdoption-pt-query-digest--review-history 'history_table' => 'global_query_review_history', );
（4）應用pt-query-digest剖析日記並將剖析成果導入數據庫
pt-query-digest --user=slowlog \
--password=123456 \
--review h=192.168.1.190,D=slow_query_log,t=global_query_review \
--review-history h=192.168.1.190,D=slow_query_log,t=global_query_review_history\
--no-report --limit=0% \
--filter=" \$event->{Bytes} = length(\$event->{arg}) and \$event->{hostname}=\"$HOSTNAME\"" \
/usr/local/mysql/data/slow.log
