记录mysql性能查询过程

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

CREATE TABLE IF NOT EXISTS `foo` (

`a` int(10) unsigned NOT NULL AUTO_INCREMENT,

`b` int(10) unsigned NOT NULL,

`c` varchar(100) NOT NULL,

PRIMARY KEY (`a`),

KEY `bar` (`b`,`a`)

) ENGINE=InnoDB;

CREATE TABLE IF NOT EXISTS `foo2` (

`a` int(10) unsigned NOT NULL AUTO_INCREMENT,

`b` int(10) unsigned NOT NULL,

`c` varchar(100) NOT NULL,

PRIMARY KEY (`a`),

KEY `bar` (`b`,`a`)

) ENGINE=MyISAM;

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

<?php

$host = '192.168.100.166';

$dbName = 'test';

$user = 'root';

$password = '';

$db = mysql_connect($host, $user, $password) or die('DB connect failed');

mysql_select_db($dbName, $db);

echo '===================InnoDB=======================' . "\r\n";

$start = microtime(true);

mysql_query("SELECT SQL_NO_CACHE SQL_CALC_FOUND_ROWS * FROM foo WHERE b = 1 LIMIT 1000, 10");

$end = microtime(true);

echo $end - $start . "\r\n";

echo '===================MyISAM=======================' . "\r\n";

$start = microtime(true);

mysql_query("SELECT SQL_NO_CACHE SQL_CALC_FOUND_ROWS * FROM foo2 WHERE b = 1 LIMIT 1000, 10");

$end = microtime(true);

echo $end - $start . "\r\n";

2

3

4

5

Mysql > set profiling = 1;

Mysql>show profiles;

Mysql>show profile for query 1;