表结构

CREATE TABLE `test` (
`column_1` int(11) NOT NULL AUTO_INCREMENT,
`column_2` int(11) NOT NULL,
`column_3` int(11) NOT NULL,
`column_4` int(11) NOT NULL,
`column_5` datetime NOT NULL,
`column_6` time NOT NULL,
 PRIMARY KEY (`column_1`),
UNIQUE KEY `index_1` (`column_2`,`column_3`),
UNIQUE KEY `index_2` (`column_2`,`column_4`),
KEY `index_3` (`column_3`),
KEY `index_4` (`column_4`),
KEY `index_5` (`column_2`),
KEY `index_6` (`column_5`,`column_2`),
CONSTRAINT `fk_1` FOREIGN KEY (`column_3`) REFERENCES `test2`(`id`),
CONSTRAINT `fk_2` FOREIGN KEY (`column_4`) REFERENCES `test2` (`id`),
CONSTRAINT `fl_3` FOREIGN KEY (`column_2`) REFERENCES `link` (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=14164023 DEFAULT CHARSET=utf8;

当我运行以下查询时，对于column_2的不同值，大约需要5-8秒。有人可以帮助更好地执行此操作吗？

SELECT count(*)  FROM test WHERE test.column_2= 26 and
test.column_5 between '2015-06-01 00:00:00' AND
'2015-06-30 00:00:00'  ;

注意：通过在mysql工作台上执行查询来捕获所提到的时间

Answer 1

您的column_5目前有column_2，然后是BETWEEN，因此MySQL首先尝试根据column_2子句进行过滤。但是MySQL有限制，在范围模式下使用索引后，它不能使用索引的第二部分（此blog post中的更多信息）。

优化此类查询的正确方法是将 equation 列作为索引的第一部分，将 range 列作为第二列。然后，MySQL将选择26值为column_5的行，然后使用索引的第二部分根据KEY `ind_c2_c5` (`column_2`,`column_5`)日期范围进一步过滤它们。

所以解决方案是有一个索引：

<?php 

include_once('inc/class.simple_mail.php');
include_once('inc/gump.class.php');

include_once('mail-config.php');



// Check Data
$isValid = GUMP::is_valid($_POST, array(
	'first-name' => 'required',
	'last-name' => 'required',
	'phone-number' => 'required',
	'email-address' => 'required|valid_email',
	'address' => 'required',
	'city' => 'required',
	'zip-code' => 'required',
	));
	

if($isValid === true) {

	// Submit Mail
	$mail = new SimpleMail();
	$mail->setTo(YOUR_EMAIL_ADDRESS, YOUR_COMPANY_NAME)
	->setSubject('New car rental request')
	->setFrom(htmlspecialchars($_POST['email-address']), htmlspecialchars($_POST['first-name'].' '.$_POST['last-name']))
	->addGenericHeader('X-Mailer', 'PHP/' . phpversion())
	->addGenericHeader('Content-Type', 'text/html; charset="utf-8"')
	->setMessage(createMessage($_POST))
	->setWrap(100);

	$mail->send();


	// Submit Client Mail
	$mailClient = new SimpleMail();
	$mailClient->setTo(htmlspecialchars($_POST['email-address']), htmlspecialchars($_POST['first-name'].' '.$_POST['last-name']))
	->setSubject('Youre car rental request at '.YOUR_COMPANY_NAME)
	->setFrom(YOUR_EMAIL_ADDRESS, YOUR_COMPANY_NAME)
	->addGenericHeader('X-Mailer', 'PHP/' . phpversion())
	->addGenericHeader('Content-Type', 'text/html; charset="utf-8"')
	->setMessage(createClientMessage($_POST))
	->setWrap(100);

	$mailClient->send();

	$result = array(
		'result' => 'success', 
		'msg' => array('Success! Your contact request has been send.')
		);

	echo json_encode($result);

} else {
	$result = array(
		'result' => 'error', 
		'msg' => $isValid
		);

	echo json_encode($result);
}


function createMessage($formData)
{
                    $message = $_POST['first-name']. " Booked a ".$_POST['selected-car']."Contact :".$_POST['phone-number'];
					//$message   = $_POST['first-name']. "Booked a Tata Innova From Website"; //Corrected string
					$user="demo";//don't change this thing
					$password = "demopass";//don't change this thing
					$from      = "NANDHI";   // //don't change this thing - Sender ID
					$to        = "9566376463";   // Ph# txt message is sent to //Corrected double quote
					
					
					$fields = array( ///URL Details that you are sending... 
					 'user' 	=> 	urlencode($user),
					 'password' => 	urlencode($password),
					 'phone'    =>	urlencode($to),
					 'text'     =>	urlencode($message),
					 'type' 	=> 	't',
					 'senderid' =>	urlencode($from),
				    );
					
					foreach($fields as $key=>$value) { $fields_string .= $key.'='.$value.'&'; }
					rtrim($fields_string,'&');
					$url       = 'http://login.redsms.in/API/SendMessage.ashx?'.$fields_string;
					$ch = curl_init();
					
					curl_setopt($ch,CURLOPT_URL,$url);
					curl_setopt($ch,CURLOPT_POST,count($fields));
					curl_setopt($ch,CURLOPT_POSTFIELDS,$fields_string);

					$result = curl_exec($ch);
					curl_close($ch);
}

function createClientMessage($formData)
{
	$body  = 	"Hello ".htmlspecialchars($formData['first-name'])." ".htmlspecialchars($formData['last-name'])."<br><br>";
	$body .=	"We appreciate your interest in our offer. Your request has been successfully forwarded to us.<br>";
	$body .=	"We will deal with it immediately and contact you as soon as possible in contact with you.<br><br>";
	$body .=	"For further questions we are happy to help! <br><br>";
	$body .=	"Best regards<br>".YOUR_COMPANY_NAME;


	return $body;
}






















// $mail = new SimpleMail();
// $mail->setTo('mail@themeinjection.com', 'Your Email')
// ->setSubject('Test Message')
// ->setFrom('no-reply@domain.com', 'Domain.com')
// ->addMailHeader('Reply-To', 'no-reply@domain.com', 'Domain.com')
// ->addMailHeader('Cc', 'bill@example.com', 'Bill Gates')
// ->addMailHeader('Bcc', 'steve@example.com', 'Steve Jobs')
// ->addGenericHeader('X-Mailer', 'PHP/' . phpversion())
// ->addGenericHeader('Content-Type', 'text/html; charset="utf-8"')
// ->setMessage('<strong>This is a test message.</strong>')
// ->setWrap(100);
//$send = $mail->send();
//echo ($send) ? 'Email sent successfully' : 'Could not send email';


//echo json_encode(array('data' => 'test data'));

/* AJAX check  */
// if(!empty($_SERVER['HTTP_X_REQUESTED_WITH']) && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest') {
// 	echo json_encode(array('data' => 'test data'));
// }
// else
// {
// 	echo 'no ajax';
// }

顺便说一下，给索引描述性名称更好，所以你一眼就知道它们的用途......

调整大小超过2GB的表的SQL查询

表结构

1 个答案: