I currently getting a 2 million records from different tables to generate a url to create a sitemap. The script eat too much resources and use 100% of the servers performance
query
SELECT CONCAT("/url/profile/id/",u.id,"/",nickname) as url FROM users AS u
UNION ALL
Select CONCAT("url/city/", c.id, "/paramId/",p.id,"/",Replace(p.title, " ", "+"),"/",r.region_Name,"/",c.city_Name) AS url
From city c
Join region r On r.id = c.id_region
Join country country On country.id = c.id_country
cross join param p
Where country.used = 1
And p.active = 1
//i store it on an array $url_list then process for creating a sitemap..but it takes time and to much resources
//i tried to get the data by batch using LIMIT 0,50000
but getting the maxrow for paging takes time. also the code doesn't look good for i have to run a two query that has a large data
$url_list = array();
$maxrow = SELECT COUNT(*) AS max from (
SELECT CONCAT("/url/profile/id/",u.id,"/",nickname) as url FROM users AS u
UNION ALL
Select CONCAT("url/city/", c.id, "/paramId/",p.id,"/",Replace(p.title, " ", "+"),"/",r.region_Name,"/",c.city_Name) AS url
From city c
Join region r On r.id = c.id_region
Join country country On country.id = c.id_country
cross join param p
Where country.used = 1
And p.active = 1) as tmp
$limit = 50,000;
$bybatch = ceil($maxrow/$limit);
$start = 0;
for($i = 0;$i < $bybatch; $i++){
// run query and store to $result
(SELECT CONCAT("/url/profile/id/",u.id,"/",nickname) as url FROM users AS u
UNION ALL
Select CONCAT("url/city/", c.id, "/paramId/",p.id,"/",Replace(p.title, " ", "+"),"/",r.region_Name,"/",c.city_Name) AS url
From city c
Join region r On r.id = c.id_region
Join country country On country.id = c.id_country
cross join param p
Where country.used = 1
And p.active = 1 LIMIT $start,$limit);
$start += $limit;
//push to $url_list
$url_list = array_push($result);
}
//when finish i use this to create a site map
$linkCount = 1;
$fileNomb = 1;
$i = 0;
foreach ($url_list as $ul) {
$i += 1;
if ($linkCount == 1) {
$doc = new DOMDocument('1.0', 'utf-8');
$doc->formatOutput = true;
$root = $doc->createElementNS('http://www.sitemaps.org/schemas/sitemap/0.9', 'urlset');
$doc->appendChild($root);
}
$url= $doc->createElement("url");
$loc= $doc->createElement("loc", $ul['url']);
$url->appendChild($loc);
$priority= $doc->createElement("priority",1);
$url->appendChild($priority);
$root->appendChild($url);
$linkCount += 1;
if ($linkCount == 49999) {
$f = fopen($this->siteMapMulti . $fileNomb .'.xml', "w");
fwrite($f,$doc->saveXML());
fclose($f);
$linkCount = 1;
$fileNomb += 1;
}
}
Any better way to do this? or to speed up the performance?
Added
Why is this faster than sql query but consumes 1 hundred percent of the servers resources and performance
$this->db->query('SELECT c.id, c.city_name, r.region_name, cr.country_name FROM city AS c, region AS r, country AS cr WHERE r.id = c.id_region AND cr.id = c.id_country AND cr.id IN (SELECT id FROM country WHERE use = 1)');
$arrayCity = $this->db->recordsArray(MYSQL_ASSOC);
$this->db->query('SELECT id, title FROM param WHERE active = 1');
$arrayParam = $this->db->recordsArray(MYSQL_ASSOC);
foreach ($arrayCity as $city) {
foreach ($arrayParam as $param) {
$paramTitle = str_replace(' ', '+', $param['title']);
$url = 'url/city/'. $city['id'] .'/paramId/'. $param['id'] .'/'. $paramTitle .'/'. $city['region_name'] .'/'. $city['city_name'];
$this->addChild($url);
}
}