PHP with MySQL is Slow

Question

(IMPORTANT) EDIT 3: Running the testajax2.php by itself and NOT AJAX. The duration is about the same, 1.02-1.03s. So I guess that means the problem is in PHP-MYSQL or XAMPP?? When ran through phpmyadmin query, here's the result: Showing rows 0 - 29 ( ~50 total , Query took 0.0015 sec). It appears the problem lies not in Ajax after all, but perhaps in PHP. Help please... (I've also just edited the question title.)

Answer: Add the following line in the hosts file located in ”C:\Windows\System32\drivers\etc”

   127.0.0.1 localhost

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The question before: Is it normal for Jquery Ajax with sql queries on the other side have the minimum duration of 1 sec? I've tried $.get, $.post,$.getjson,$.ajax({type:'POST'}), $.ajax({type:'GET'}). As I've said, it's the minimum, it could get worse to about 3 sec even. I doubt it's the sql queries though, as when I try them in phpmyadmin, the results come up extremely fast.

It doesn't matter also if the queries are very simple and the table only has 2 elements, it would still follow the 1 sec minimum. I'm using the latest XAMPP, and I don't know if it matters, but I'm accessing the files through localhost and 127.0.0.1. Thanks!

EDIT: Thanks for the reply, guys. I'm running it on a local environment, on the same laptop I made these files on. Jquery is updated. The returned value/array is json_encoded. I'm using mysqli. The database is in InnoDB, and within are only about 5 tables, and there are hardly anything on them. Here's a very simple sample query:

index.php

    var test_id =2;
    testcall();
    function testcall(){
        $.ajax({
            url: 'testajax2.php',
            type: 'POST',
            data: {test_id: test_id},
            success: function(data){

            }       
        }); 
    }

testajax2.php

    $mysqli = new mysqli('localhost', 'root', '', 'testdb');
    $mysqli->set_charset("utf8");
    if(mysqli_connect_errno()) {
        echo "Connection Failed: " . mysqli_connect_errno();
        exit();
    }

    $testreceive = $_POST['test_id'];
    $query = "SELECT First_Name from tblperson";
    $result = $mysqli->query($query);
    $row = $result->fetch_all(MYSQLI_ASSOC);

    echo json_encode($row);

The tblperson contains 50 records, and there are only 4 columns. According to Firebug, it took 1.03s to do that extremely simple task. I'm not sure what it really means, but viewing through Net tab in Firebug, the bar is entirely violet. 0 and 1.03s Waiting. +1.03s and 0 Receiving.

EDIT 2: It also doesn't matter if I send them as json_encode($row) or foreach($row as $value){ echo $value['First_Name']; }. It would still be about at least 1 sec. I've tried on Chrome and Safari, and though I can't have the exact duration, I can tell that it's about the same. But for simple ajax call with NO SQL QUERIES. If I remember correctly, it's very fast. I'd be back with a sample and duration output.

Answer 1

Answer: Add the following line in the hosts file located in ”C:\Windows\System32\drivers\etc”

   127.0.0.1 localhost

This solved my problem. PHP-MySQL can now complete its task depending on how complex somewhere between 20-500ms.

Answer 2

It could be happening in a couple of places: 1) the query itself, or 2) the creation of the mysqli instance (and resulting db connection). If I had to guess, I suspect your problem is (2).

One quick-and-dirty debugging method is to use microtime().

http://www.php.net/manual/en/function.microtime.php

Example:

$start = microtime(TRUE); // Start counting

$mysqli = new mysqli('localhost', 'root', '', 'testdb');

$temp = microtime(TRUE) - $start;
echo "Time to connect: {$temp}";  // Check elapsed time

$mysqli->set_charset("utf8");
if(mysqli_connect_errno()) {
    echo "Connection Failed: " . mysqli_connect_errno();
    exit();
}

$temp = microtime(TRUE) - $start;
echo "Time to setup: {$temp}";  // Check elapsed time

$testreceive = $_POST['test_id'];
$query = "SELECT First_Name from tblperson";
$result = $mysqli->query($query);

$temp = microtime(TRUE) - $start;
echo "Time to query: {$temp}";  // Check elapsed time

$row = $result->fetch_all(MYSQLI_ASSOC);

$temp = microtime(TRUE) - $start;
echo "Time to fetch {$temp}";  // Check elapsed time

Answer 3

The problem is the localhost lookup from localhost to 127.0.0.1.

The solution is to either add the line 127.0.0.1 localhost to your windows hosts file as @Wap has answered (and thank you for you answer!)

Or if you do not have access to the hosts file, you can simply change localhost to 127.0.0.1 in your php mysqli call: $mysqli = new mysqli('127.0.0.1'), 'root', '', 'testdb');