MySQL中用通用查詢日誌找出查詢次數最多的語句的教程

wh7577發表於2021-09-09
MySql

MySQL開啟通用查詢日誌general log
mysql開啟general log之後，所有的查詢語句都可以在general log檔案中以可讀的方式得到，但是這樣general log檔案會非常大，所以預設都是關閉的。有的時候為了查錯等原因，還是需要暫時開啟general log的（本次測試只修改在記憶體中的引數值，不設定引數檔案）。

general_log支援動態修改：

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1 mysql> select version();

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123456 +-----------+| version() |+-----------+| 5.6.16  |+-----------+1 row in set (0.00 sec)

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1 mysql> set global general_log=1;

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1 Query OK, 0 rows affected (0.03 sec)

general_log支援輸出到table：

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1 mysql> set global log_output='TABLE';

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1 Query OK, 0 rows affected (0.00 sec)

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1 mysql> select * from mysql.general_logG;

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 *************************** 1. row *************************** event_time: 2014-08-14 10:53:18  user_host: root[root] @ localhost []  thread_id: 3  server_id: 0command_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: 0command_type: Query  argument: select * from mysql.general_log2 rows in set (0.00 sec)ERROR: No query specified

輸出到file：

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1 mysql> set global log_output='FILE';

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1 Query OK, 0 rows affected (0.00 sec)

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

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1 Query OK, 0 rows affected (0.01 sec)

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

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1234 /home/mysql/mysql/bin/mysqld, Version: 5.6.16 (Source distribution). started with:Tcp port: 3306 Unix socket: /home/mysql/logs/mysql.sockTime         Id Command  Argument140814 10:56:44   3 Query   select * from mysql.general_log

查詢次數最多的SQL語句

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

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PS：mysql general log日誌清除技巧
mysql general log日誌不能直接刪除，間接方法

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


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