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MySQL中用通用查询日志找出查询次数最多的语句的教程_MySQL

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Libérer: 2016-05-27 13:46:21
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MySQL开启通用查询日志general log
mysql打开general log之后,所有的查询语句都可以在general log文件中以可读的方式得到,但是这样general log文件会非常大,所以默认都是关闭的。有的时候为了查错等原因,还是需要暂时打开general log的(本次测试只修改在内存中的参数值,不设置参数文件)。

general_log支持动态修改:

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mysql> select version();

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+-----------+

| version() |

+-----------+

| 5.6.16  |

+-----------+

1 row in set (0.00 sec)

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mysql> set global general_log=1;

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Query OK, 0 rows affected (0.03 sec)

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general_log支持输出到table:

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mysql> set global log_output='TABLE';

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Query OK, 0 rows affected (0.00 sec)

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mysql> select * from mysql.general_log\G;

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*************************** 1. row ***************************

 event_time: 2014-08-14 10:53:18

  user_host: root[root] @ localhost []

  thread_id: 3

  server_id: 0

command_type: Query

  argument: select * from mysql.general_log

*************************** 2. row ***************************

 event_time: 2014-08-14 10:54:25

  user_host: root[root] @ localhost []

  thread_id: 3

  server_id: 0

command_type: Query

  argument: select * from mysql.general_log

2 rows in set (0.00 sec)

ERROR:

No query specified

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输出到file:

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mysql> set global log_output='FILE';

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Query OK, 0 rows affected (0.00 sec)

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mysql> set global general_log_file='/tmp/general.log';

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Query OK, 0 rows affected (0.01 sec)

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[root@mysql-db101 tmp]# more /tmp/general.log

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/home/mysql/mysql/bin/mysqld, Version: 5.6.16 (Source distribution). started with:

Tcp port: 3306 Unix socket: /home/mysql/logs/mysql.sock

Time         Id Command  Argument

140814 10:56:44   3 Query   select * from mysql.general_log

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查询次数最多的SQL语句

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analysis-general-log.py general.log | sort | uniq -c | sort -nr

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1032 SELECT * FROM wp_comments WHERE ( comment_approved = 'x' OR comment_approved = 'x' ) AND comment_post_ID = x ORDER BY comment_date_gmt DESC

653 SELECT post_id, meta_key, meta_value FROM wp_postmeta WHERE post_id in (x) ORDER BY meta_id ASC

527 SELECT FOUND_ROWS()

438 SELECT t.*, tt.* FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON t.term_id = tt.term_id WHERE tt.taxonomy = 'x' AND t.term_id = x limit

341 SELECT option_value FROM wp_options WHERE option_name = 'x' limit

329 SELECT t.*, tt.*, tr.object_id FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON tt.term_id = t.term_id INNER JOIN wp_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy in (x) AND tr.object_id in (x) ORDER BY t.name ASC

311 SELECT wp_posts.* FROM wp_posts WHERE 1= x AND wp_posts.ID in (x) AND wp_posts.post_type = 'x' AND ((wp_posts.post_status = 'x')) ORDER BY wp_posts.post_date DESC

219 SELECT wp_posts.* FROM wp_posts WHERE ID in (x)

218 SELECT tr.object_id FROM wp_term_relationships AS tr INNER JOIN wp_term_taxonomy AS tt ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy in (x) AND tt.term_id in (x) ORDER BY tr.object_id ASC

217 SELECT wp_posts.* FROM wp_posts WHERE 1= x AND wp_posts.ID in (x) AND wp_posts.post_type = 'x' AND ((wp_posts.post_status = 'x')) ORDER BY wp_posts.menu_order ASC

202 SELECT SQL_CALC_FOUND_ROWS wp_posts.ID FROM wp_posts WHERE 1= x AND wp_posts.post_type = 'x' AND (wp_posts.post_status = 'x') ORDER BY wp_posts.post_date DESC limit

118 SET NAMES utf8

115 SET SESSION sql_mode= 'x'

115 SELECT @@SESSION.sql_mode

112 SELECT option_name, option_value FROM wp_options WHERE autoload = 'x'

111 SELECT user_id, meta_key, meta_value FROM wp_usermeta WHERE user_id in (x) ORDER BY umeta_id ASC

108 SELECT YEAR(min(post_date_gmt)) AS firstdate, YEAR(max(post_date_gmt)) AS lastdate FROM wp_posts WHERE post_status = 'x'

108 SELECT t.*, tt.* FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON t.term_id = tt.term_id WHERE tt.taxonomy in (x) AND tt.count > x ORDER BY tt.count DESC limit

107 SELECT t.*, tt.* FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON t.term_id = tt.term_id WHERE tt.taxonomy in (x) AND t.term_id in (x) ORDER BY t.name ASC

107 SELECT * FROM wp_users WHERE ID = 'x'

106 SELECT SQL_CALC_FOUND_ROWS wp_posts.ID FROM wp_posts WHERE 1= x AND wp_posts.post_type = 'x' AND (wp_posts.post_status = 'x') AND post_date > 'x' ORDER BY wp_posts.post_date DESC limit

106 SELECT SQL_CALC_FOUND_ROWS wp_posts.ID FROM wp_posts WHERE 1= x AND wp_posts.post_type = 'x' AND (wp_posts.post_status = 'x') AND post_date > 'x' ORDER BY RAND() DESC limit

105 SELECT SQL_CALC_FOUND_ROWS wp_posts.ID FROM wp_posts WHERE 1= x AND wp_posts.post_type = 'x' AND (wp_posts.post_status = 'x') AND post_date > 'x' ORDER BY wp_posts.comment_count DESC limit

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PS:mysql general log日志清除技巧
mysql general log日志不能直接删除,间接方法

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USE mysql;

CREATE TABLE gn2 LIKE general_log;

RENAME TABLE general_log TO oldLogs, gn2 TO general_log;

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