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Make CopyStatusStats migration use batches of 1000 to avoid locks (#8256)

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Eugen Rochko 2018-08-18 03:44:50 +02:00 • committed by GitHub
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1 changed files with 10 additions and 7 deletions
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db/migrate/20180812173710_copy_status_stats.rb
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@ -3,13 +3,16 @@ class CopyStatusStats < ActiveRecord::Migration[5.2]
def up
safety_assured do
execute <<-SQL.squish
INSERT INTO status_stats (status_id, reblogs_count, favourites_count, created_at, updated_at)
SELECT id, reblogs_count, favourites_count, created_at, updated_at
FROM statuses
ON CONFLICT (status_id) DO UPDATE
SET reblogs_count = EXCLUDED.reblogs_count, favourites_count = EXCLUDED.favourites_count
SQL
Status.where.not(id: StatusStat.select('status_id')).select('id').find_in_batches do |statuses|
execute <<-SQL.squish
INSERT INTO status_stats (status_id, reblogs_count, favourites_count, created_at, updated_at)
SELECT id, reblogs_count, favourites_count, created_at, updated_at
FROM statuses
WHERE id IN (#{statuses.map(&:id).join(', ')})
ON CONFLICT (status_id) DO UPDATE
SET reblogs_count = EXCLUDED.reblogs_count, favourites_count = EXCLUDED.favourites_count
SQL
end
end
end