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FIX: Optimize move to dismiss_new_topics migration (#12041)

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This migration is quite heavy because of join to all potential topics which should be `dismissed` for each user. To make it a little bit more efficient I did two things:
- move conditions to join so it should use fewer rows
- do that in batches - 1000 users at the time
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Krzysztof Kotlarek 2021-02-12 08:05:38 +11:00 committed by GitHub
parent 395a903cf6
commit 7426764af4
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1 changed files with 21 additions and 16 deletions
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37
db/migrate/20210208022738_move_new_since_to_new_table.rb
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@ -2,35 +2,40 @@
class MoveNewSinceToNewTable < ActiveRecord::Migration[6.0]
def up
sql = <<~SQL
User.find_in_batches do |users|
sql = <<~SQL
INSERT INTO dismissed_topic_users (user_id, topic_id, created_at)
SELECT users.id, topics.id, user_stats.new_since
FROM user_stats
JOIN users ON users.id = user_stats.user_id
JOIN user_options ON user_options.user_id = users.id
LEFT JOIN topics ON topics.created_at <= user_stats.new_since
AND topics.archetype <> :private_message
AND topics.created_at >= GREATEST(CASE
WHEN COALESCE(user_options.new_topic_duration_minutes, :default_duration) = :always THEN users.created_at
WHEN COALESCE(user_options.new_topic_duration_minutes, :default_duration) = :last_visit THEN COALESCE(users.previous_visit_at,users.created_at)
ELSE (:now::timestamp - INTERVAL '1 MINUTE' * COALESCE(user_options.new_topic_duration_minutes, :default_duration))
END, :min_date)
LEFT JOIN topic_users ON topics.id = topic_users.topic_id AND users.id = topic_users.user_id
LEFT JOIN dismissed_topic_users ON dismissed_topic_users.topic_id = topics.id AND users.id = dismissed_topic_users.user_id
WHERE user_stats.new_since IS NOT NULL
AND topic_users.id IS NULL
AND topics.id IS NOT NULL
AND dismissed_topic_users.id IS NULL
AND topics.archetype <> :private_message
AND topics.created_at >= GREATEST(CASE
WHEN COALESCE(user_options.new_topic_duration_minutes, :default_duration) = :always THEN users.created_at
WHEN COALESCE(user_options.new_topic_duration_minutes, :default_duration) = :last_visit THEN COALESCE(users.previous_visit_at,users.created_at)
ELSE (:now::timestamp - INTERVAL '1 MINUTE' * COALESCE(user_options.new_topic_duration_minutes, :default_duration))
END, :min_date)
AND users.id IN (:user_ids)
ORDER BY topics.created_at DESC
LIMIT :max_new_topics
SQL
DB.exec(sql,
now: DateTime.now,
last_visit: User::NewTopicDuration::LAST_VISIT,
always: User::NewTopicDuration::ALWAYS,
default_duration: SiteSetting.default_other_new_topic_duration_minutes,
min_date: Time.at(SiteSetting.min_new_topics_time).to_datetime,
private_message: Archetype.private_message,
max_new_topics: SiteSetting.max_new_topics)
SQL
DB.exec(sql,
now: DateTime.now,
last_visit: User::NewTopicDuration::LAST_VISIT,
always: User::NewTopicDuration::ALWAYS,
default_duration: SiteSetting.default_other_new_topic_duration_minutes,
min_date: Time.at(SiteSetting.min_new_topics_time).to_datetime,
private_message: Archetype.private_message,
user_ids: users.map(&:id),
max_new_topics: SiteSetting.max_new_topics)
end
end
def down