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PERF: improve perf on consistency query in importers

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This commit is contained in:
Régis Hanol 2014-09-08 22:08:41 +02:00
parent 9d9d93ad3c
commit 78bcea5247
1 changed files with 17 additions and 2 deletions
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19
script/import_scripts/base.rb
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@ -468,8 +468,23 @@ class ImportScripts::Base
end
def update_last_posted_at
puts "", "updaing last posted at on users"
User.exec_sql("UPDATE users SET last_posted_at = (SELECT MAX(posts.created_at) FROM posts WHERE posts.user_id = users.id)")
puts "", "updating last posted at on users"
sql = <<-SQL
WITH lpa AS (
SELECT user_id, MAX(posts.created_at) AS last_posted_at
FROM posts
GROUP BY user_id
)
UPDATE users
SET last_posted_at = lpa.last_posted_at
FROM users u1
JOIN lpa ON lpa.user_id = u1.id
WHERE u1.id = users.id
AND users.last_posted_at <> lpa.last_posted_at
SQL
User.exec_sql(sql)
end
def update_feature_topic_users