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Do not use WHERE NOT IN in CopyStatusStats migration (#8281) 

Fix #8275

As the batch operation progresses, the statuses_stats table grows,
and the WHERE NOT IN subquery becomes more expensive
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Eugen Rochko 2018-08-19 02:01:49 +02:00 committed by GitHub
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db/migrate/20180812173710_copy_status_stats.rb
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@ -3,7 +3,7 @@ class CopyStatusStats < ActiveRecord::Migration[5.2]
def up def up
safety_assured do safety_assured do
Status.where.not(id: StatusStat.select('status_id')).select('id').find_in_batches do |statuses| Status.unscoped.select('id').find_in_batches(batch_size: 5_000) do |statuses|
execute <<-SQL.squish execute <<-SQL.squish
INSERT INTO status_stats (status_id, reblogs_count, favourites_count, created_at, updated_at) INSERT INTO status_stats (status_id, reblogs_count, favourites_count, created_at, updated_at)
SELECT id, reblogs_count, favourites_count, created_at, updated_at SELECT id, reblogs_count, favourites_count, created_at, updated_at