Ladsgroup added a comment.
So tendril doesn't have anything in sampled queries: https://tendril.wikimedia.org/report/sampled_queries?host=^db&user=wikiuser&schema=wik&hours=1 (maybe it's not sampling from codfw?) I looked at the code in depth and found a couple of queries. The queries I see in the performance schema of db2083 are: SELECT `chd_site` , `chd_db` , `chd_seen` , `chd_touched` , `chd_lock` , `chd_disabled` , `change_time` FROM `wb_changes_dispatch` LEFT JOIN `wb_changes` ON ( ( `chd_seen` = `change_id` ) ) WHERE `chd_disabled` = ? ORDER BY `chd_seen` AS UPDATE `wb_changes` SET `change_type` = ? , `change_time` = ? , `change_object_id` = ? , `change_revision_id` = ? , `change_user_id` = ? , `change_info` = ? WHERE `change_id` = ? INSERT INTO `wb_changes` ( `change_type` , `change_time` , `change_object_id` , `change_revision_id` , `change_user_id` , `change_info` ) VALUES (...) SELECT MIN ( `change_id` ) AS `min_id` , MAX ( `change_id` ) AS `max_id` , MIN ( `change_time` ) AS `min_time` , MAX ( `change_time` ) AS `max_time` FROM `wb_changes` LIMIT ? DELETE FROM `wb_changes` WHERE ( `change_time` < ? ) SELECT MAX ( `change_id` ) AS `maxid` FROM `wb_changes` LIMIT ? SELECT `change_id` , `change_type` , `change_time` , `change_object_id` , `change_revision_id` , `change_user_id` , `change_info` FROM `wb_changes` WHERE `change_id` IN (...) SELECT `change_id` , `change_type` , `change_time` , `change_object_id` , `change_revision_id` , `change_user_id` , `change_info` FROM `wb_changes` WHERE `change_id` = ? SELECT MIN ( `change_time` ) AS TIMESTAMP FROM `wb_changes_dispatch` , `wb_changes` WHERE `chd_disabled` = ? AND ( `chd_seen` = `change_id` ) LIMIT ? Mostly are straightforward but I actually found a query on master in the code that's like this (found it in performance schema of db2079 too): SELECT `change_id` , `change_type` , `change_time` , `change_object_id` , `change_revision_id` , `change_user_id` , `change_info` FROM `wb_changes` WHERE `change_revision_id` = ? LIMIT ? (With exec count of ~12,510,000 and total latency of 3150724249736000) so I think we need to bring back the index on revision id but the rest can be safely dropped. TASK DETAIL https://phabricator.wikimedia.org/T262856 EMAIL PREFERENCES https://phabricator.wikimedia.org/settings/panel/emailpreferences/ To: Marostegui, Ladsgroup Cc: Kormat, Marostegui, Lucas_Werkmeister_WMDE, Addshore, Aklapper, Ladsgroup, LSobanski, Akuckartz, Iflorez, darthmon_wmde, Nandana, Lahi, Gq86, GoranSMilovanovic, QZanden, LawExplorer, Minhnv-2809, _jensen, rosalieper, Scott_WUaS, Jonas, Wikidata-bugs, aude, Lydia_Pintscher, Mbch331, Jay8g, Krenair
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