I wrote this query to find all page moves done in fawiki in 2017, and
determine how many edits the performing user had prior to that page move.
The query tries to use indexes, as much as I could think of, and yet it
runs for a very long time (more than 20 min, at which point it gets killed).
Any ideas on how to further optimize this query is appreciated!
Thanks,
Huji
use fawiki_p;
select
log_id,
log_timestamp,
log_user,
log_user_text,
log_title,
log_comment,
log_page,
page_namespace,
case when ug_group = 'bot' then 1 else 0 end as user_is_bot,
(
select count(*)
from revision_userindex
where
rev_user = log_user
and rev_timestamp < log_timestamp
) as rev_count_before_move
from logging
join page
on page_id = log_page
left join user_groups
on log_user = ug_user
and ug_group = 'bot'
where log_action = 'move'
and log_timestamp > '20170101000000'