查询日志的作用是记录所有客户端发来的sql语句，也就是记录客户端的所有操作

Log参数将要过时，现在用general_log来代替

打开查询日志功能

mysql> showvariables like "%log";

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

| Variable_name| Value |

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

| back_log| 50|

| general_log| OFF|

| log| OFF|

| relay_log||

| slow_query_log | OFF|

| sync_binlog| 0|

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

6 rows in set (0.01 sec)

mysql> set global general_log=1;

Query OK, 0 rows affected (0.18 sec)

mysql> set globallog=1;

Query OK, 0 rows affected, 1 warning (0.00sec)

mysql> showvariables like "%log";

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

| Variable_name| Value |

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

| back_log| 50|

| general_log| ON|

| log| ON|

| relay_log||

| slow_query_log | OFF|

| sync_binlog| 0|

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

6 rows in set (0.00 sec)

也可以在my.cnf中添加参数

general_log=1

general_log_file=/tmp/chenzhongyang.log这样来设定

mysql> show variables like"%file";

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

| Variable_name| Value|

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

| ft_stopword_file| (built-in)|

| general_log_file| /tmp/chenzhongyang.log|

| init_file||

| local_infile| ON|

| pid_file|/usr/local/mysql/var/test4.wolf.org.pid |

| relay_log_info_file | relay-log.info|

| slow_query_log_file |/usr/local/mysql/var/test4-slow.log|

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

查看日志文件的内容

[root@test4 ~]# tail -f/tmp/chenzhongyang.log

/usr/local/mysql/libexec/mysqld, Version:5.1.70-log (Source distribution). started with:

Tcp port: 3306Unix socket: /tmp/mysql.sock

TimeId CommandArgument

130903 16:09:431 Connectroot@localhost on

1 Queryselect@@version_comment limit 1

130903 16:10:141 Queryshow variables like "%file"

130903 16:12:091 Queryselect * fromtt

130903 16:12:161 QuerySELECT DATABASE()

1 Init DBtest

130903 16:12:181 Queryselect * fromtt

一般情况下我们不打开查询日志功能，因为他对系统效率的影响很大

管理查询日志文件

一般的日志文件会很大，所以要处理日志

[root@test4 ~]# mysqladminflush-logs;刷新日志所有日志文件