hometown/db/migrate/20180812173710_copy_status_stats.rb
Eugen Rochko f13afa1ee9
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
2018-08-19 02:01:49 +02:00

23 lines
703 B
Ruby

class CopyStatusStats < ActiveRecord::Migration[5.2]
disable_ddl_transaction!
def up
safety_assured do
Status.unscoped.select('id').find_in_batches(batch_size: 5_000) 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
def down
# Nothing
end
end