MySQL Slow query analysis

Source: Internet
Author: User
Tags mysql slow query log percona

MySQL Slow query analysis

Posted: 29. 08.2014 | Author: Zdz | Category: MySQL

MySQL Slow Query log analysis

1. Pt-query-digest Analysis Slow query log
Pt-query-digest–report Slow.log

2. Report a slow query for the last half hour:
Pt-query-digest–report–since 1800s Slow.log

3. Report a slow query for a time period:
Pt-query-digest–report–since ' 2013-02-10 21:48:59 ' –until ' 2013-02-16 02:33:50 ' Slow.log

4. Report a slow query with only the SELECT statement:
Pt-query-digest–filter ' $event->{fingerprint} =~ m/^select/i ' Slow.log

5. Report a slow query for a user:
Pt-query-digest–filter ' ($event->{user} | | "") =~ m/^root/i ' Slow.log

6. Report all full-table scans or slow queries for the complete join:
Pt-query-digest–filter ' (($event->{full_scan} | | "") eq "yes") | | (($event->{full_join} | | "") eq "yes") ' Slow.log

Visualize analysis results for slow query logs
Query-digest-ui

In fact, this is a very simple and straightforward tool to browse and statistics MySQL slow query, AJAX-based web interface.

Configuration Query-digest-ui:

Download:
wget Https://nodeload.github.com/kormoc/Query-Digest-UI/zip/master
Unzip Query-digest-ui-master.zip

The following steps are visualized for query analysis results:

1) Create related database tables

–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 () unsigned not NULL,

' Fingerprint ' text is not NULL,

' Sample ' Longtext not NULL,

' First_seen ' datetime DEFAULT NULL,

' Last_seen ' datetime DEFAULT NULL,

' reviewed_by ' varchar DEFAULT NULL,

' reviewed_on ' datetime DEFAULT NULL,

' Comments ' text,

' reviewed_status ' varchar 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 (+) not NULL,

' Db_max ' varchar (+) DEFAULT NULL,

' Checksum ' bigint () 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) Create a database account

$ 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 ' @ ' percent ' identified by ' 123456 ';"

3) configuration 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 and 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) Use Pt-query-digest to analyze logs and import analysis results into the database

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

MySQL Slow query analysis

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.