同大多數(shù)關(guān)系型數(shù)據(jù)庫一樣，日志文件是MySQL數(shù)據(jù)庫的重要組成部分。MySQL有幾種不同的日志文件，通常包括錯(cuò)誤日志文件，二進(jìn)制日志，通用日志，慢查詢?nèi)罩?#xff0c;等等。這些日志可以幫助我們定位mysqld內(nèi)部發(fā)生的事件，數(shù)據(jù)庫性能故障，記錄數(shù)據(jù)的變更歷史，用戶恢復(fù)數(shù)據(jù)庫等等。本文主要描述通用查詢?nèi)罩尽?/p>

1、MySQL日志文件系統(tǒng)的組成

2、通用查詢?nèi)罩?/p>

3、通用查詢?nèi)罩镜南到y(tǒng)變量

4、通用查詢?nèi)罩镜膫浞?/p>

5、演示通用查詢?nèi)罩镜氖褂?/p>

a、啟用通用查詢?nèi)罩?/p>

--演示環(huán)境

root@localhost[(none)]> show variables like '%version%';

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

| Variable_name | Value |

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

| innodb_version | 5.5.39 |

| protocol_version | 10 |

| slave_type_conversions | |

| version | 5.5.39-log |

| version_comment | MySQL Community Server (GPL) |

| version_compile_machine | x86_64 |

| version_compile_os | Linux |

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

--查看系統(tǒng)變量

root@localhost[(none)]> show variables like '%general%';

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

| Variable_name | Value |

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

| general_log | OFF |

| general_log_file | /var/lib/mysql/suse11b.log |

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

--查看當(dāng)前的通用日志，顯示無日志文件

root@localhost[(none)]> system ls /var/lib/mysql/suse11b.log

ls: cannot access /var/lib/mysql/suse11b.log: No such file or directory

--設(shè)置變量general_log以開啟通用查詢?nèi)罩?/p>

root@localhost[(none)]> set @@global.general_log=1;

Query OK, 0 rows affected (0.00 sec)

--再次查看通用日志文件已存在

root@localhost[(none)]> system ls /var/lib/mysql/suse11b.log

/var/lib/mysql/suse11b.log

root@localhost[(none)]> select * from tempdb.tb1; --執(zhí)行查詢

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

| id | val |

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

| 1 | jack |

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

--查看通用日志文件內(nèi)容

root@localhost[(none)]> system more /var/lib/mysql/suse11b.log

/usr/sbin/mysqld, Version: 5.5.39-log (MySQL Community Server (GPL)). started with:

Tcp port: 3306 Unix socket: /var/lib/mysql/mysql.sock

Time Id Command Argument

141003 16:18:12 4 Query show variables like '%general%'

141003 16:18:55 4 Query select * from tempdb.tb1

b、更改通用查詢?nèi)罩疚恢?/p>

root@localhost[(none)]> exit

Bye

suse11b:~ # service mysql stop

Shutting down MySQL... done

suse11b:~ # mysqld --general_log_file=/tmp/suse11b.log --user=mysql &

[1] 47009

suse11b:~ # ps -ef|grep mysql|grep -v grep

mysql 47009 44514 1 16:22 pts/0 00:00:00 mysqld --general_log_file=/tmp/suse11b.log --user=mysql

root 47053 44514 0 16:22 pts/0 00:00:00 grep mysql

suse11b:~ # mysql

root@localhost[(none)]> system ls /tmp/suse11b.log

ls: cannot access /tmp/suse11b.log: No such file or directory

root@localhost[(none)]> show variables like '%gener%';

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

| Variable_name | Value |

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

| general_log | OFF |

| general_log_file | /tmp/suse11b.log |

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

root@localhost[(none)]> set global general_log=on;

Query OK, 0 rows affected (0.01 sec)

--此時(shí)從系統(tǒng)變量看出，通用日志已經(jīng)到/tmp目錄下

root@localhost[(none)]> show variables like '%gener%';

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

| Variable_name | Value |

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

| general_log | ON |

| general_log_file | /tmp/suse11b.log |

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

--發(fā)布查詢

root@localhost[(none)]> select count(*) from tempdb.tb1;

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

| count(*) |

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

| 1 |

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

--查看通用日志文件內(nèi)容

root@localhost[(none)]> system more /tmp/suse11b.log

mysqld, Version: 5.5.39-log (MySQL Community Server (GPL)). started with:

Tcp port: 3306 Unix socket: /var/lib/mysql/mysql.sock

Time Id Command Argument

141003 16:30:03 1 Query show variables like '%gener%'

141003 16:30:09 1 Query select count(*) from tempdb.tb1

c、通用查詢?nèi)罩据敵龇绞?/p>

--可以輸出為文件，表以及不輸出，即TABLE，FILE，NONE

--系統(tǒng)變量log_output

root@localhost[(none)]> show variables like 'log_output';

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

| Variable_name | Value |

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

| log_output | FILE |

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

--下面修改為輸出為表方式

root@localhost[(none)]> set global log_output='TABLE';

Query OK, 0 rows affected (0.00 sec)

root@localhost[(none)]> show variables like 'log_output';

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

| Variable_name | Value |

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

| log_output | TABLE |

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

--發(fā)布查詢

root@localhost[(none)]> select * from tempdb.tb1;

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

| id | val |

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

| 1 | jack |

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

--Author: Leshami

--Blog : http://blog.csdn.net/leshami

root@localhost[(none)]> system more /tmp/suse11b.log

mysqld, Version: 5.5.39-log (MySQL Community Server (GPL)). started with:

Tcp port: 3306 Unix socket: /var/lib/mysql/mysql.sock

Time Id Command Argument

141003 16:30:03 1 Query show variables like '%gener%'

141003 16:30:09 1 Query select count(*) from tempdb.tb1

141003 16:31:00 1 Query show variables like 'log_output'

141003 17:00:48 1 Query set global log_output='TABLE' #通用查詢?nèi)罩据敵龅轿募H僅記錄到全局變量的修改

--mysql.general_log記錄了通用查詢?nèi)罩镜男畔?/p>

root@localhost[(none)]> desc mysql.general_log;

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

| Field | Type | Null | Key | Default | Extra |

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

| event_time | timestamp | NO | | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP |

| user_host | mediumtext | NO | | NULL | |

| thread_id | int(11) | NO | | NULL | |

| server_id | int(10) unsigned | NO | | NULL | |

| command_type | varchar(64) | NO | | NULL | |

| argument | mediumtext | NO | | NULL | |

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

--從通用查詢?nèi)罩颈砝锊榭赐ㄓ貌樵內(nèi)罩镜膬?nèi)容

root@localhost[(none)]> select thread_id,command_type,argument from mysql.general_log;

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

| thread_id | command_type | argument |

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

| 1 | Query | show variables like 'log_output' |

| 1 | Query | select * from tempdb.tb1 |

| 1 | Query | desc mysql.general_log |

| 1 | Query | select thread_id,command_type,argument from mysql.general_log |

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

root@localhost[(none)]> show variables like 'log_output';

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

| Variable_name | Value |

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

| log_output | TABLE |

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

--使用FILE,TABLE 2者混合輸出通用日志

root@localhost[(none)]> set global log_output='file,table';

Query OK, 0 rows affected (0.00 sec)

root@localhost[(none)]> select @@global.log_output;

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

| @@global.log_output |

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

| FILE,TABLE |

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

root@localhost[(none)]> insert into tempdb.tb1 values(2,'robinson');

Query OK, 1 row affected (0.06 sec)

root@localhost[(none)]> commit;

Query OK, 0 rows affected (0.01 sec)

--驗(yàn)證結(jié)果，表和文件里邊存在通用的日志記錄

root@localhost[(none)]> system tail /tmp/suse11b.log|grep robinson

141003 17:41:54 2 Query insert into tempdb.tb1 values(2,'robinson')

root@localhost[(none)]> select thread_id,command_type,argument from mysql.general_log

-> where argument like '%robinson%';

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

| thread_id | command_type | argument |

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

| 2 | Query | insert into tempdb.tb1 values(2,'robinson') |

| 2 | Query | select thread_id,command_type,argument from mysql.general_log |

| | | where argument like ''robinson'' |

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

d、關(guān)閉通用查詢?nèi)罩?/p>

--可以通過設(shè)置系統(tǒng)變量general_log來關(guān)閉通用查詢?nèi)罩?#xff0c;此時(shí)日志輸出設(shè)置為FILE,TABLE

root@localhost[(none)]> show variables like 'log_output';

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

| Variable_name | Value |

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

| log_output | FILE,TABLE |

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

root@localhost[(none)]> set global general_log=off;

Query OK, 0 rows affected (0.01 sec)

root@localhost[(none)]> show variables like '%gener%';

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

| Variable_name | Value |

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

| general_log | OFF |

| general_log_file | /tmp/suse11b.log |

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

root@localhost[(none)]> delete from tempdb.tb1 where id=2;

Query OK, 1 row affected (0.12 sec)

root@localhost[(none)]> commit;

Query OK, 0 rows affected (0.00 sec)

root@localhost[(none)]> system tail -n 1 /tmp/suse11b.log

141003 17:45:13 2 Query set global general_log=off

root@localhost[(none)]> select thread_id,command_type,argument from mysql.general_log

-> where argument like '%delete%';

Empty set (0.00 sec)

--從上面的演示可知，盡管我們設(shè)置了log_output為FILE,TABLE，但general_log為OFF，通用日志無任何記錄產(chǎn)生

root@localhost[(none)]> set global log_output=none;

Query OK, 0 rows affected (0.00 sec)

root@localhost[(none)]> set global general_log=1;

Query OK, 0 rows affected (0.00 sec)

root@localhost[(none)]> truncate table tempdb.tb1;

Query OK, 0 rows affected (0.01 sec)

root@localhost[(none)]> system tail -n 1 /tmp/suse11b.log

Time Id Command Argument

--通過上面的演示，在log_output=none,general_log=on的清下下無任何通用日志輸出。

相關(guān)標(biāo)簽：日志

本文原創(chuàng)發(fā)布php中文網(wǎng)，轉(zhuǎn)載請注明出處，感謝您的尊重！

總結(jié)

以上是生活随笔為你收集整理的mysql通用查询日志_MySQL通用查询日志(GeneralQueryLog)_MySQL的全部內(nèi)容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網(wǎng)站內(nèi)容還不錯(cuò)，歡迎將生活随笔推薦給好友。