Patch for "1.6_STABLE" branch: https://reviews.mahara.org/3158
-- You received this bug notification because you are a member of Mahara Contributors, which is subscribed to Mahara. Matching subscriptions: Subscription for all Mahara Contributors -- please ask on #mahara-dev or mahara.org forum before editing or unsubscribing it! https://bugs.launchpad.net/bugs/1081947 Title: Use of CAST() causes extreme slowdown in large MySQL sites Status in Mahara ePortfolio: Fix Committed Status in Mahara 1.6 series: In Progress Status in Mahara 1.7 series: In Progress Status in Mahara 1.8 series: Fix Released Status in Mahara 1.9 series: Fix Committed Bug description: Mahara version 1.5.2 Linux CentOS release 5.8 PHP Version 5.3.15 MySQL 5.0.77 When editing a page and trying to add a normal text box by dragging it into the page, this loads for approx 2 minutes or more and then eventually appears. It happens with a journal too but all others are fine and are instant as they should be. I'm not getting any apache log errors for this nor general server errors. The only thing I am able to see is the query that it hangs on for this length of time.... it is the below... I hope someone can help as obviously this is causing quite a lot of issues for the users!! Anyone able to diagnose what is the issue here? The thing is, there is another exact version of the Mahara site alongside this one but just a blank version which runs perfectly fine so this must be an issue within the database somewhere or the maharadata. Query below: this hangs for about 1 minute 45.. SELECT a.*, CAST(a.owner IS NOT NULL AND a.owner = '1739' AS UNSIGNED) AS editable FROM "artefact" a LEFT OUTER JOIN "artefact_parent_cache" apc ON (a.id = apc.artefact AND a.institution = 'mahara' AND apc.parent = 371) WHERE ( a.owner = '1739' OR a.id IN ( SELECT aar.artefact FROM "group_member" m JOIN "artefact" aa ON m.group = aa.group JOIN "artefact_access_role" aar ON aar.role = m.role AND aar.artefact = aa.id WHERE m.member = '1739' AND aar.can_republish = 1 ) OR a.id IN (SELECT artefact FROM "artefact_access_usr" WHERE usr = '1739' AND can_republish = 1) OR a.institution IN ('test','mahara') ) AND artefacttype IN('blog')ORDER BY title ASC LIMIT 10 | Then this one for the rest of the time until eventually the text box or journal appears on the page: SELECT COUNT(*) FROM "artefact" a LEFT OUTER JOIN "artefact_parent_cache" apc ON (a.id = apc.artefact AND a.institution = 'mahara' AND apc.parent = 371) WHERE ( a.owner = '1739' OR a.id IN ( SELECT aar.artefact FROM "group_member" m JOIN "artefact" aa ON m.group = aa.group JOIN "artefact_access_role" aar ON aar.role = m.role AND aar.artefact = aa.id WHERE m.member = '1739' AND aar.can_republish = 1 ) OR a.id IN (SELECT artefact FROM "artefact_access_usr" WHERE usr = '1739' AND can_republish = 1) OR a.institution IN ('test','mahara') ) AND artefacttype IN('blogpost') | Thank you for your help To manage notifications about this bug go to: https://bugs.launchpad.net/mahara/+bug/1081947/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~mahara-contributors Post to : mahara-contributors@lists.launchpad.net Unsubscribe : https://launchpad.net/~mahara-contributors More help : https://help.launchpad.net/ListHelp
