Joomla 3.8 query cache crashing server

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Joomla 3.8 query cache crashing server

Post by naghris » Mon Nov 20, 2017 5:25 pm

Our site started to crash after 3.8 some time. Now the current Joomla!-version is 3.8.2. Not sure if this is related to Joomla-version or what. The host said that queries like these are jamming the server and these are creating tmp-tables and the server slows down and crashes.

Can somebody hint if these queries are from Joomla! core or some module. There are a lot of Display News by BK-modules and could that be the reason? Or any way to see this?

Code: Select all

FROM EXT_content AS a
LEFT JOIN EXT_categories AS c ON = a.catid
LEFT JOIN EXT_users AS ua ON = a.created_by
LEFT JOIN EXT_users AS uam ON = a.modified_by
LEFT JOIN EXT_categories as parent ON = c.parent_id
LEFT JOIN EXT_content_rating AS v ON = v.content_id
WHERE a.access IN (1,1) AND c.access IN (1,1) AND c.published = 1 AND a.state = 1 AND a.catid = 2 AND (a.publish_up = '0000-00-00 00:00:00' OR a.publish_up <= '2017-11-19 12:28:39') AND (a.publish_down = '0000-00-00 00:00:00' OR a.publish_down >= '2017-11-19 12:28:39')
ORDER BY    CASE WHEN a.publish_up = '0000-00-00 00:00:00' THEN a.created ELSE a.publish_up END  DESC ,  a.created   LIMIT 21 |    0.000 |
| 622 | kestavyys_u | localhost:41537 | kestavyys_v2 | Query   |    5 | Copying to tmp table         | SELECT DISTINCT, a.title, a.alias, a.introtext, a.fulltext, a.checked_out, a.checked_out_time, a.catid, a.created, a.created_by, a.created_by_alias, CASE WHEN c.published = 2 AND a.state > 0 THEN 2 WHEN c.published != 1 THEN 0 ELSE a.state END as state,CASE WHEN a.modified = '0000-00-00 00:00:00' THEN a.created ELSE a.modified END as modified, a.modified_by, as modified_by_name,CASE WHEN a.publish_up = '0000-00-00 00:00:00' THEN a.created ELSE a.publish_up END as publish_up,a.publish_down, a.images, a.urls, a.attribs, a.metadata, a.metakey, a.metadesc, a.access, a.hits, a.xreference, a.featured, a.language,  LENGTH(a.fulltext) AS readmore, a.ordering,c.title AS category_title, c.path AS category_route, c.access AS category_access, c.alias AS category_alias,c.published, c.published AS parents_published, c.lft,CASE WHEN a.created_by_alias > ' ' THEN a.created_by_alias ELSE END AS author, AS author_email,parent.title as parent_title, as parent_id, parent.path as parent_route, parent.alias as parent_alias,COALESCE(NULLIF(ROUND(v.rating_sum  / v.rating_count, 0), 0), 0) AS rating, 
							COALESCE(NULLIF(v.rating_count, 0), 0) as rating_count
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