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SQL : performances

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Tentative de reformulation de la requête principale pour améliorer les
performances.
Utilisation d'une sous-jointure qui retourne uniquement e.id.
Sur mon serveur avec 13000 articles, la requête de la page d'accueil
sans article non lu mettait 1.38s avant le patch, contre 0.08s après (en
désactivant bien sûr le cache SQL).

Il faudra re-tester et tenter d'autres optimisations (notamment sur les
index) avec un nombre d'articles plus important.

Avant :
SELECT SQL_NO_CACHE e.id, e.guid, e.title, e.author,
UNCOMPRESS(e.content_bin) AS content, e.link, e.date, e.is_read,
e.is_favorite, e.id_feed, e.tags FROM `freshrss_alex_entry` e INNER JOIN
`freshrss_alex_feed` f ON e.id_feed = f.id WHERE f.priority > 0 AND
(e.id >= 1371597014000000 OR e.is_favorite = 1 OR f.keep_history = 1)
ORDER BY e.id DESC LIMIT 33;

Après :
SELECT SQL_NO_CACHE e.id, e.guid, e.title, e.author,
UNCOMPRESS(e.content_bin) AS content, e.link, e.date, e.is_read,
e.is_favorite, e.id_feed, e.tags FROM `freshrss_alex_entry` e INNER JOIN
(SELECT e1.id FROM `freshrss_alex_entry` e1 INNER JOIN
`freshrss_alex_feed` f ON e1.id_feed = f.id WHERE f.priority > 0 AND
(e1.id >= 1371597014000000 OR e1.is_favorite = 1 OR f.keep_history = 1)
ORDER BY e1.id DESC LIMIT 33) e2 ON e2.id = e.id ORDER BY e.id DESC;
This commit is contained in:
Alexandre Alapetite
2013-12-16 00:50:24 +01:00
parent a2421185d0
commit 529d6bcd15
2 changed files with 18 additions and 16 deletions
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4
app/Controllers/indexController.php
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@@ -124,9 +124,11 @@ class FreshRSS_index_Controller extends Minz_ActionController {
}
}
$today = @strtotime('today');
// on calcule la date des articles les plus anciens qu'on affiche
$nb_month_old = $this->view->conf->oldEntries ();
$date_min = time () - (3600 * 24 * 30 * $nb_month_old);
$date_min = $today - (3600 * 24 * 30 * $nb_month_old); //Do not use a fast changing value such as time() to allow SQL caching
try {
$entries = $this->entryDAO->listWhere($getType, $getId, $state, $order, $nb + 1, $first, $filter, $date_min);