Optimize a count SQL query on a big table - php

Question

I have a table with over 10 thousand registers right now, and they start to run so slow.
I have the following code:
COUNT
$SqlCount = "SELECT tabnews.New_Id
FROM tabnew WHERE New_Id <> '' AND New_Status = 1";
$QueryCount = mysql_query($SqlCount, $Conn) or die(mysql_error($Conn));
$NumCount = mysql_num_rows($QueryCount);
$recordCount = $NumCount;
PAGINATION
if (!$id) $p = 1;
else $p = $id;
$pageSize = 16;
$itemIni = ($pageSize*$p)-$pageSize;
$totalPage = ceil($recordCount/$pageSize);
SHOW
$Sql52 = "SELECT New_Id, New_Nome, New_Data, New_Imagem FROM tabnews WHERE New_Status = 1 ORDER BY New_Id DESC LIMIT $itemIni, $pageSize ";
$Query52 = mysql_query($Sql52, $Conn);
while($Rs52 = mysql_fetch_array($Query52)){
// ECHO RESULTS
}
MY DATABASE:
CREATE TABLE IF NOT EXISTS `tabnews` (
`New_Id` int(11) NOT NULL AUTO_INCREMENT,
`Franquia_Id` text NOT NULL,
`New_Slide` int(2) NOT NULL,
`Categoria_Id` int(2) NOT NULL,
`New_Nome` varchar(255) NOT NULL,
`New_Data` date NOT NULL,
`New_Imagem` varchar(75) NOT NULL,
`New_Status` int(11) NOT NULL,
PRIMARY KEY (`New_Id`),
KEY `idx_1` (`New_Status`)
) ENGINE=MyISAM DEFAULT CHARSET=latin1 AUTO_INCREMENT=10490 ;
Any ideas on how I can make this run faster?
I have a dedicated server running CENTOS.

Answer 1

This:
New_Id <> ''
What does this do? It casts every single one of your INT primary key to string to compare it to a string. Why would you compare it to a string? It cannot be '' by definition, omit that New_Id <> '' from your WHERE clause.

Answer 2

20 seconds is very weird for such a little table.
I have a very similar table with almost 4 million rows and your both SQL statements takes less than 0.002 sec.
CREATE TABLE IF NOT EXISTS `tasks` (
`id` int(11) NOT NULL AUTO_INCREMENT,
`status` varchar(10) COLLATE utf8_unicode_ci NOT NULL DEFAULT 'open',
`method` varchar(10) COLLATE utf8_unicode_ci NOT NULL DEFAULT 'GET',
`url` varchar(255) COLLATE utf8_unicode_ci NOT NULL,
`params` text COLLATE utf8_unicode_ci,
`response` text COLLATE utf8_unicode_ci,
`executed_by` varchar(50) COLLATE utf8_unicode_ci DEFAULT '',
`execute_at` datetime DEFAULT NULL,
`created` datetime NOT NULL,
`modified` datetime NOT NULL,
PRIMARY KEY (`id`),
KEY `status` (`status`),
KEY `modified` (`modified`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8 COLLATE=utf8_unicode_ci AUTO_INCREMENT=3839270 ;
-
SELECT COUNT(id) FROM tasks WHERE status='done';
---> Query took 0.0008 sec
-
SELECT id, status, method, url FROM tasks WHERE status='done' ORDER BY id DESC LIMIT 200, 100;
---> Query took 0.0011 sec
Observations:
You should use SELECT COUNT(New_Id)...
New_id <> '' doesn't make sense. New_id can't be empty or NULL
Set the length of New_Status to something that match the values you store there
Try turning off logging: SET GLOBAL general_log = 'OFF';
Update your server packages (specially MySQL)
Is it a dedicated server only for the database?
Is the server running other things? (run 'top' and 'uptime' to check it status)