mysql slow speed simple query

Question

I have a very simple sql query which is just a select * from "table name" I have not indexed my table or anything else special.

The problem is that when I execute it through phpmyadmin , the query takes about 0.003 seconds but when I execute it through a browser in my web site it takes about 3 minutes!

There are 20K rows in the table and 19 fields. Can anyone help me?

include "config.php"; //Connect to Database

$query= mysql_query("SELECT * FROM table_name");
$num_rsl=mysql_num_rows($query);
echo '<table border="1">';
    for($i=0; $i <$num_rsl; $i++)
{
echo '<tr>';
$row=mysql_fetch_assoc($query);

    echo '<td>'.$row['id'].'</td>';
    echo '<td>'.$row['idLeistung'].'</td>';
    echo '<td>'.$row['dtEAN'].'</td>';
    echo '<td>'.$row['dtReifenBreite'].'</td>';
    echo '<td>'.$row['dtReifenQuerschnitt'].'</td>';
    echo '<td>'.$row['dtReifenBauart'].'</td>';
    echo '<td>'.$row['dtReifentragfahigkeit'].'</td>';
    echo '<td>'.$row['dtReifenGeschwindigkeitsindex'].'</td>';
    echo '<td>'.$row['dtReifenTTTL'].'</td>';
    echo '<td>'.$row['dtReifenProfil'].'</td>';
    echo '<td>'.$row['dtHersteller'].'</td>';
    echo '<td>'.$row['dtbestand'].'</td>';
    echo '<td>'.$row['FZG'].'</td>';
    echo '<td>'.$row['dtEinsatzZweck'].'</td>';
    echo '<td>'.$row['dtArtikelNr'].'</td>';
    echo '<td>'.$row['dtBeschreibung'].'</td>';
    echo '<td>'.$row['dtArtikelNrA2'].'</td>';
    echo '<td>'.$row['dtFremdVKPreis'].'</td>'; 
    echo '</tr>';
}
echo '</table>';

Answer 1

Usually, phpmyadmin modifies queries you issue through it to MySQL to limit the number of rows in the result set. Your

SELECT * FROM table_name 

most likely gets changed by phpmyadmin to

SELECT * FROM table_name LIMIT 0, 30

Pulling thirty rows certainly takes less time than pulling all the rows.

@scones mentioned this in the comments: pulling 20K rows from a table, turning them into a big old HTML table, and sending them over the wire to your browser takes a lot of elapsed time. But that elapsed time is probably mostly determined by the performance of your web server (where PHP runs) and the wire between server and browser.