Huji, note I suggested SHOW EXPLAIN, not EXPLAIN; it is a different command, check the link I provided and report if that doesn't work for you.
On Fri, Sep 23, 2016 at 5:31 PM, Huji Lee <[email protected]> wrote: > See https://quarry.wmflabs.org/query/12718 and the error message returned. > > EXPLAIN only works if you have access to the underlying tables. I only > have access to the VIEWs built on top of actual wiki tables (for good > reason, same applies to most of us) so I get an error when I try EXPLAIN. > > On Fri, Sep 23, 2016 at 11:24 AM, Jaime Crespo <[email protected]> > wrote: > >> Explain (you should be able to run SHOW EXPLAIN on your own queries: >> http://s.petrunia.net/blog/?p=89): >> >> EXPLAIN select page_title, count(ll_lang) from page join category on >> page_title = cat_title left join categorylinks on page_title = cl_to left >> join templatelinks on tl_from = page_id and tl_namespace = 10 and tl_title >> in ( 'رده_خالی' , 'رده_بهتر', 'رده_ابهامزدایی', 'رده_ردیابیکردن' ) left >> join langlinks on page_id = ll_from where page_namespace = 14 and >> page_is_redirect = 0 and cl_to is null and tl_title is null group by >> page_title order by 2, 1 limit 5000\G >> *************************** 1. row *************************** >> id: 1 >> select_type: SIMPLE >> table: page >> type: ref >> possible_keys: name_title,page_redirect_namespace_len >> key: page_redirect_namespace_len >> key_len: 5 >> ref: const,const >> rows: 364273 >> Extra: Using where; Using temporary; Using filesort >> *************************** 2. row *************************** >> id: 1 >> select_type: SIMPLE >> table: category >> type: eq_ref >> possible_keys: cat_title >> key: cat_title >> key_len: 257 >> ref: fawiki.page.page_title >> rows: 1 >> Extra: Using index >> *************************** 3. row *************************** >> id: 1 >> select_type: SIMPLE >> table: categorylinks >> type: ref >> possible_keys: cl_timestamp,cl_sortkey >> key: cl_timestamp >> key_len: 257 >> ref: fawiki.page.page_title >> rows: 12 >> Extra: Using where; Using index >> *************************** 4. row *************************** >> id: 1 >> select_type: SIMPLE >> table: templatelinks >> type: ref >> possible_keys: tl_from,tl_namespace >> key: tl_namespace >> key_len: 4 >> ref: const >> rows: 390610 >> Extra: Using where; Using index >> *************************** 5. row *************************** >> id: 1 >> select_type: SIMPLE >> table: langlinks >> type: ref >> possible_keys: ll_from >> key: ll_from >> key_len: 4 >> ref: fawiki.page.page_id >> rows: 104910 >> Extra: Using index >> >> On Fri, Sep 23, 2016 at 5:16 PM, Huji Lee <[email protected]> wrote: >> >>> Hi all, >>> >>> I have a query [1] which I run weekly to identify empty categories; >>> those that don't have interwiki links and stay empty for a while are then >>> deleted by a sysop. >>> >>> The query ran just fine every week until Sep 2nd. [2] Since then, the >>> query times out and the page doesn't get updated. >>> >>> The query is no that complex (a SELECT with five JOINs) and used to >>> finish in about 3-5 minutes. I don't have EXPLAIN access on Labs so I >>> cannot tell what is slowing it down. Can someone kindly take a look and >>> advise why this suddenly stopped working? >>> >>> Thanks, >>> >>> Huji >>> >>> [1] https://quarry.wmflabs.org/query/3760 >>> [2] https://fa.wikipedia.org/w/index.php?title=%D9%88%DB%8C%DA%A >>> 9%DB%8C%E2%80%8C%D9%BE%D8%AF%DB%8C%D8%A7:%DA%AF%D8%B2%D8%A7% >>> D8%B1%D8%B4_%D8%AF%DB%8C%D8%AA%D8%A7%D8%A8%DB%8C%D8%B3/% >>> D8%B1%D8%AF%D9%87%E2%80%8C%D9%87%D8%A7%DB%8C_%D8%AE%D8%A7% >>> D9%84%DB%8C&action=history&uselang=en >>> >>> _______________________________________________ >>> Labs-l mailing list >>> [email protected] >>> https://lists.wikimedia.org/mailman/listinfo/labs-l >>> >>> >> >> >> -- >> Jaime Crespo >> <http://wikimedia.org> >> >> _______________________________________________ >> Labs-l mailing list >> [email protected] >> https://lists.wikimedia.org/mailman/listinfo/labs-l >> >> > > _______________________________________________ > Labs-l mailing list > [email protected] > https://lists.wikimedia.org/mailman/listinfo/labs-l > > -- Jaime Crespo <http://wikimedia.org>
_______________________________________________ Labs-l mailing list [email protected] https://lists.wikimedia.org/mailman/listinfo/labs-l
