puyopuyotetr.is/db/migrate/20171226094803_more_faster_index_on_notifications.rb

class MoreFasterIndexOnNotifications < ActiveRecord::Migration[5.1]
  disable_ddl_transaction!

  def change
    add_index :notifications, [:account_id, :id], order: { id: :desc }, algorithm: :concurrently
    remove_index :notifications, name: :index_notifications_on_id_and_account_id_and_activity_type
  end
end
more faster index on notifications table (#6108) 2017-12-27 01:56:31 +09:00			`class MoreFasterIndexOnNotifications < ActiveRecord::Migration[5.1]`
Use disable_ddl_transaction! to prevent warnings on migration (#6183) Migration is wrapped by transaction, so manual `commit_db_transaction` without transaction restarting causes "there is no transaction in progress" warnings. We should use `disable_ddl_transaction!` instead, if we can omit transaction completely. 2018-01-05 03:38:29 +09:00			`disable_ddl_transaction!`

more faster index on notifications table (#6108) 2017-12-27 01:56:31 +09:00			`def change`
			`add_index :notifications, [:account_id, :id], order: { id: :desc }, algorithm: :concurrently`
			`remove_index :notifications, name: :index_notifications_on_id_and_account_id_and_activity_type`
			`end`
			`end`