jcrespo added a comment.

  There is this procedure: 
https://wikitech.wikimedia.org/wiki/MariaDB/query_performance which could be 
done for Wikidata by people with root database privileges, however it is quite 
involved. I will ask if maybe Manuel wants to perform soon such a thing for 
other main reasons (e.g. MCR changes checking) and maybe this could be checked 
at the same time.
  
  There is also performance_schema storing digests 
<https://dev.mysql.com/doc/refman/5.7/en/sys-statement-analysis.html>, but it 
is unreliable due to the large amount of different query patterns mw/wikibase 
gets (it gets quickly out of memory after a server gets started). If the query 
was stored there, it howerver can reliably say when was the last time it was 
executed.
  
  Note that due to volume, all queries are almost impossible to be checked, 
only a high sigma of it, probabilistically.

TASK DETAIL
  https://phabricator.wikimedia.org/T246232

EMAIL PREFERENCES
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To: Ladsgroup, jcrespo
Cc: Michael, Lucas_Werkmeister_WMDE, Addshore, Aklapper, Marostegui, Ladsgroup, 
jcrespo, Hazizibinmahdi, Akuckartz, Iflorez, darthmon_wmde, alaa_wmde, Nandana, 
jijiki, Klaas_Z4us_V, Lahi, Gq86, GoranSMilovanovic, QZanden, LawExplorer, 
elukey, _jensen, rosalieper, Scott_WUaS, Jonas, Wikidata-bugs, aude, 
Lydia_Pintscher, Mbch331, Jay8g
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