1.运行环境:xampp1.7.3,mysql版本为5.1.41

2.开启slow log:

(1)打开d:/xampp/mysql/bin/my.ini,设置

slow_query_log      = 1

slow_query_log_file = "d:/xampp/mysql/data/mysql-slow.log"

long_query_time=0//新加

(2)D:\xampp\mysql\data\下新建txt文件mysql-slow.log

(3)重启或启动xampp中apache mysql

注:(2)必须后跟(3),看后面的log记录开头几行就会明白

3.测试:运行脚本(注:仅测试log使用,无die等处理错误)

$h=mysql_connect("localhost",'root','');

mysql_select_db("test",$h);

mysql_query("flush status");

$res=mysql_query("select t1.id from t1 inner join t2 on t1.id=t2.id");

while($r=mysql_fetch_assoc($res)){

var_dump($r);

}

mysql_close($h);

?>

以下是运行该脚本的log记录

D:\xampp\mysql\bin\mysqld.exe, Version: 5.1.41-log (Source distribution). started with:

TCP Port: 3306, Named Pipe: MySQL

Time                 Id Command    Argument

# Time: 111124 15:32:10

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.040057  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

use test;

SET timestamp=1322119930;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# Time: 111124 15:33:23

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.040058  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322120003;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# Time: 111124 15:33:49

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.040058  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322120029;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# Time: 111124 15:34:07

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.030044  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322120047;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# Time: 111124 15:34:29

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.030043  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322120069;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# Time: 111124 15:34:56

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.030044  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322120096;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# Time: 111124 15:34:58

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.020029  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322120098;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.040058  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322120098;

select t1.id from t1 inner join t2 on t1.id=t2.id;

4.在my.ini中改long_query_time=0.04,也就是40毫秒,重启xampp,以下是运行脚本的log结果:

D:\xampp\mysql\bin\mysqld.exe, Version: 5.1.41-log (Source distribution). started with:

TCP Port: 3306, Named Pipe: MySQL

Time                 Id Command    Argument

# Time: 111124 15:41:40

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.040057  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

use test;

SET timestamp=1322120500;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# Time: 111124 15:41:54

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.040058  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322120514;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# Time: 111124 15:41:56

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.040058  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322120516;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# Time: 111124 15:41:59

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.040057  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322120519;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.040057  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322120519;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.040058  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322120519;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# Time: 111124 15:45:41

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.070101  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322120741;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.040057  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322120741;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# Time: 111124 15:45:42

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.040058  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322120742;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.040058  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322120742;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# Time: 111124 15:45:43

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.040058  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322120743;

select t1.id from t1 inner join t2 on t1.id=t2.id;

5. 在my.ini中改long_query_time=0,重启xampp运行脚本

$h=mysql_connect("localhost",'root','');

mysql_select_db("test",$h);

$res=mysql_query("select t1.id from t1 inner join t2 on t1.id=t2.id");

while($r=mysql_fetch_assoc($res)){

var_dump($r);

}

mysql_close($h);

?>

以下是log结果:

D:\xampp\mysql\bin\mysqld.exe, Version: 5.1.41-log (Source distribution). started with:

TCP Port: 3306, Named Pipe: MySQL

Time                 Id Command    Argument

# Time: 111124 16:00:05

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.030043  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

use test;

SET timestamp=1322121605;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# Time: 111124 16:00:27

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.040057  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322121627;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# Time: 111124 16:00:28

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.040057  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322121628;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# Time: 111124 16:00:45

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.010015  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322121645;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# Time: 111124 16:00:46

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.010014  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322121646;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.040058  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322121646;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# Time: 111124 16:00:47

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.020029  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322121647;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# Time: 111124 16:00:48

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.040058  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322121648;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.040058  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322121648;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.020029  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322121648;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# Time: 111124 16:00:49

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.010014  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322121649;

select t1.id from t1 inner join t2 on t1.id=t2.id;

# Time: 111124 16:00:50

# User@Host: root[root] @ localhost [127.0.0.1]

# Query_time: 0.020029  Lock_time: 0.000000 Rows_sent: 4  Rows_examined: 4

SET timestamp=1322121650;

select t1.id from t1 inner join t2 on t1.id=t2.id;

该份脚本比3和4运行的脚本少了mysql_query("flush status");,看log记录可以看到该份脚本运行有不少0.01和0.02秒的记录,这也能看出mysql自身的缓存也加快了select的速度!

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