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 程式師世界 >> 數據庫知識 >> MYSQL數據庫 >> MySQL綜合教程 >> MySQL中用通用查詢日志找出查詢次數最多的語句的教程,

MySQL中用通用查詢日志找出查詢次數最多的語句的教程,

編輯:MySQL綜合教程

MySQL中用通用查詢日志找出查詢次數最多的語句的教程,


MySQL開啟通用查詢日志general log
mysql打開general log之後,所有的查詢語句都可以在general log文件中以可讀的方式得到,但是這樣general log文件會非常大,所以默認都是關閉的。有的時候為了查錯等原因,還是需要暫時打開general log的(本次測試只修改在內存中的參數值,不設置參數文件)。

general_log支持動態修改:

mysql> select version();
+-----------+
| version() |
+-----------+
| 5.6.16  |
+-----------+
1 row in set (0.00 sec)
mysql> set global general_log=1;
Query OK, 0 rows affected (0.03 sec)

general_log支持輸出到table:

mysql> set global log_output='TABLE';
Query OK, 0 rows affected (0.00 sec)
mysql> select * from mysql.general_log\G;
*************************** 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

輸出到file:

mysql> set global log_output='FILE';
Query OK, 0 rows affected (0.00 sec)
mysql> set global general_log_file='/tmp/general.log'; 
Query OK, 0 rows affected (0.01 sec)
[root@mysql-db101 tmp]# more /tmp/general.log 
/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

查詢次數最多的SQL語句

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

PS:mysql general log日志清除技巧
mysql general log日志不能直接刪除,間接方法

USE mysql;
CREATE TABLE gn2 LIKE general_log;
RENAME TABLE general_log TO oldLogs, gn2 TO general_log;

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