MySQL 与 MongoDB 1000 次读取

我对MongoDb非常兴奋，最近一直在测试它.我在MySQL中有一个名为posts的表，其中大约有2000万条记录只在一个名为"id"的字段上被索引.

我想将速度与MongoDB进行比较，并运行了一个测试，从我们庞大的数据库中随机获取并打印15条记录.我为mysql和MongoDB分别运行了大约1000次查询，我很惊讶我没有注意到速度上有很大的差异.也许MongoDB的速度快了1.1倍.这太令人失望了.我做错什么了吗？我知道我的测试不是完美的，但是MySQL与MunGDB相当.

• 我有双核+(2线程)i7 cpu和4GB ram
• 我在MySQL上有20个分区，每个分区有100万条记录

Sample Code Used For Testing MongoDB

<?php
function microtime_float()
{
    list($usec, $sec) = explode(" ", microtime());
    return ((float)$usec + (float)$sec);
}
$time_taken = 0;
$tries = 100;
// connect
$time_start = microtime_float();

for($i=1;$i<=$tries;$i++)
{
    $m = new Mongo();
    $db = $m->swalif;
    $cursor = $db->posts->find(array('id' => array('$in' => get_15_random_numbers())));
    foreach ($cursor as $obj)
    {
        //echo $obj["thread_title"] . "<br><Br>";
    }
}

$time_end = microtime_float();
$time_taken = $time_taken + ($time_end - $time_start);
echo $time_taken;

function get_15_random_numbers()
{
    $numbers = array();
    for($i=1;$i<=15;$i++)
    {
        $numbers[] = mt_rand(1, 20000000) ;

    }
    return $numbers;
}

?>

Sample Code For Testing MySQL

<?php
function microtime_float()
{
    list($usec, $sec) = explode(" ", microtime());
    return ((float)$usec + (float)$sec);
}
$BASE_PATH = "../src/";
include_once($BASE_PATH  . "classes/forumdb.php");

$time_taken = 0;
$tries = 100;
$time_start = microtime_float();
for($i=1;$i<=$tries;$i++)
{
    $db = new AQLDatabase();
    $sql = "select * from posts_really_big where id in (".implode(',',get_15_random_numbers()).")";
    $result = $db->executeSQL($sql);
    while ($row = mysql_fetch_array($result) )
    {
        //echo $row["thread_title"] . "<br><Br>";
    }
}
$time_end = microtime_float();
$time_taken = $time_taken + ($time_end - $time_start);
echo $time_taken;

function get_15_random_numbers()
{
    $numbers = array();
    for($i=1;$i<=15;$i++)
    {
        $numbers[] = mt_rand(1, 20000000);

    }
    return $numbers;
}
?>