Change broadcast message index

changelogs/unreleased/nicolasdular-change-broadcast-index.yml

+---
+title: Change broadcast message index
+merge_request: 23986
+author:
+type: performance

db/migrate/20200204131054_change_broadcast_message_index.rb

+# frozen_string_literal: true
+
+class ChangeBroadcastMessageIndex < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :broadcast_messages, %i(ends_at broadcast_type id), name: 'index_broadcast_message_on_ends_at_and_broadcast_type_and_id'
+    remove_concurrent_index_by_name :broadcast_messages, :index_broadcast_messages_on_starts_at_and_ends_at_and_id
+  end
+
+  def down
+    add_concurrent_index :broadcast_messages, %i(starts_at ends_at id), name: 'index_broadcast_messages_on_starts_at_and_ends_at_and_id'
+    remove_concurrent_index_by_name :broadcast_messages, :index_broadcast_message_on_ends_at_and_broadcast_type_and_id
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2020_02_03_025821) do
+ActiveRecord::Schema.define(version: 2020_02_04_131054) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "pg_trgm"
@@ -564,7 +564,7 @@ ActiveRecord::Schema.define(version: 2020_02_03_025821) do
     t.integer "cached_markdown_version"
     t.string "target_path", limit: 255
     t.integer "broadcast_type", limit: 2, default: 1, null: false
-    t.index ["starts_at", "ends_at", "id"], name: "index_broadcast_messages_on_starts_at_and_ends_at_and_id"
+    t.index ["ends_at", "broadcast_type", "id"], name: "index_broadcast_message_on_ends_at_and_broadcast_type_and_id"
   end
 
   create_table "chat_names", id: :serial, force: :cascade do |t|