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Code Packages Activity Actions 9

OPTIMIZATION: Add index to post_timings and adjust the query

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This commit is contained in:
Robin Ward 2014-08-01 13:09:16 -04:00
parent b414a3590a
commit 09d7a697bf
2 changed files with 8 additions and 4 deletions
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7
app/models/user_stat.rb
View file

@ -30,10 +30,9 @@ class UserStat < ActiveRecord::Base
FROM FROM
(SELECT pt.user_id, (SELECT pt.user_id,
COUNT(*) AS c COUNT(*) AS c
FROM post_timings AS pt FROM users AS u
WHERE pt.user_id IN ( INNER JOIN post_timings AS pt ON pt.user_id = u.id
SELECT u1.id FROM users u1 where u1.last_seen_at > :seen_at WHERE u.last_seen_at > :seen_at
)
GROUP BY pt.user_id) AS X GROUP BY pt.user_id) AS X
WHERE X.user_id = user_stats.user_id AND WHERE X.user_id = user_stats.user_id AND
X.c <> posts_read_count X.c <> posts_read_count

5
db/migrate/20140801170444_create_post_timings_user_index.rb Normal file
View file

@ -0,0 +1,5 @@
class CreatePostTimingsUserIndex < ActiveRecord::Migration
def change
add_index :post_timings, :user_id
end
end