Bardzo duże obciążenie bazy danych

[Jola]

Witam,
niestety mam chyba złą wiadomość - taki kod generuje sam Joomla w komponencie com_content (mowa tu o wersji 2.5).
Toteż zmiana (optymalizacja zapytania jest możliwa ale zniknie przy pierwszej lepszej aktualizacji)
Trzeba przeanalizować zachowanie, obciążenie baz danych na innych instalacjach Joomla 2.5
Co z tego wyniknie - zobaczymy.
Co zrobić mimo wszystko - włącz cachowanie strony lub zainstaluj i uruchom jakies rozszerzenie do cachowania

[sylwekb]

Podłączam się do wątku. W dniu dzisiejszym dostawca hostingu zresztą także kei.pl zwrócił mi uwagę na wysycenie mysqla na poziomie 85%, do tej pory miałem około 15%. Ich zdaniem poniższe polecenia wygenerowały ten straszny skok. Czy ktoś ma jakiś pomysł? Dotychczas nie miałem takich problemów.

SELECT a.id, a.title, a.alias, a.title_alias, a.introtext, a.checked_out, a.checked_out_time, a.catid, a.created, a.created_by, a.created_by_alias, CASE WHEN a.modified = 0 THEN a.created EL SE a.modified END as modified, a.modified_by, uam.name as modified_by_name,CASE WHEN a.publish_up = 0 THEN a.created ELSE a.publish_up END as publish_up,a.publish_down, a.images, a.urls, a.a ttribs, a.metadata, a.metakey, a.metadesc, a.access, a.hits, a.xreference, a.featured, LENGTH(a.fulltext) AS readmore,CASE WHEN badcats.id is not null THEN 0 ELSE a.state END AS state,c.title AS category_title, c.path AS category_route, c.access AS category_access, c.alias AS category_alias,CASE WHEN a.created_by_alias > ' ' THEN a.created_by_alias ELSE ua.name END AS author,ua email AS author_email,contact.id as contactid,parent.title as parent_title, parent.id as parent_id, parent.path as parent_route, parent.alias as parent_alias,ROUND(v.rating_sum / v.rating_c ount, 0) AS rating, v.rating_count as rating_count,c.published, CASE WHEN badcats.id is null THEN c.published ELSE 0 END AS parents_published FROM j25_content AS a LEFT JOIN j25_content_frontpage AS fp ON fp.content_id = a.id LEFT JOIN j25_categories AS c ON c.id = a.catid LEFT JOIN j25_users AS ua ON ua.id = a.created_by LEFT JOIN j25_users AS uam ON uam.id = a.modified_by LEFT JOIN ( SELECT contact.user_id, MAX(contact.id) AS id, contact.language FROM j25_contact_details AS contact WHERE contact.published = 1 GROUP BY contact.user_id, contact.language) AS contact ON contact.user_id = a.created_by LEFT JOIN j25_categories as parent ON parent.id = c.parent_id LEFT JOIN j25_content_rating AS v ON a.id = v.content_id LEFT OUTER JOIN (SELECT cat.id as id FROM j25_categories AS cat JOIN j25_categories AS parent ON cat.lft BETWEEN parent.lft AND parent.rgt WHERE parent.extension = 'com_content' AND parent.p ublished != 1 GROUP BY cat.id ) AS badcats ON badcats.id = c.id WHERE a.access IN (1,1) AND c.access IN (1,1) AND CASE WHEN badcats.id is null THEN a.state ELSE 0 END = 1 AND (a.publish_up = '0000-00-00 00:00:00' OR a.publish_up <= '2013-04-21 23:05:12')  AND (a.publish_down = '0000-00-00 00:00:00' OR a.publish_down >= '2013-04-21
23:05:12')
GROUP BY a.id, a.title, a.alias, a.title_alias, a.introtext, a.checked_out, a.checked_out_time, a.catid, a.created, a.created_by, a.created_by_alias, a.created, a.modified, a.modified_by, ua m.name, a.publish_up, a.attribs, a.metadata, a.metakey, a.metadesc, a.access, a.hits, a.xreference, a.featured, a.fulltext, a.state, a.publish_down, badcats.id, c.title, c.path, c.access, c.
alias, uam.id, ua.name, ua.email, contact.id, parent.title, parent.id, parent.path, parent.alias, v.rating_sum, v.rating_count, c.published, c.lft, a.ordering, parent.lft, fp.ordering, c.id,  a.images, a.urls
ORDER BY   fp.ordering,  a.created LIMIT 0, 25G