"I LOVE YOU AVAR" type of commit

a) Use indexes for joins
b) Choose proper column for IS NULL, in order to avoid row fetches and work on index only
c) PROFIT!!! (a query faster by a factor of tens of thousands... )

diff --git a/includes/SpecialWantedcategories.php b/includes/SpecialWantedcategories.php
index 7a35703..a47576f 100644 (file)
--- a/includes/SpecialWantedcategories.php
+++ b/includes/SpecialWantedcategories.php
@@ -35,8 +35,8 @@ class WantedCategoriesPage extends QueryPage {
                                cl_to as title,
                                COUNT(*) as value
                        FROM $categorylinks
-                       LEFT JOIN $page ON cl_to = page_title
-                       WHERE page_len IS NULL
+                       LEFT JOIN $page ON cl_to = page_title AND page_namespace = ". NS_CATEGORY ."
+                        WHERE page_title IS NULL
                        GROUP BY cl_to
                        ";
        }