Add index to last_repository_updated_at on projects

db/migrate/20170503004425_add_index_to_last_repository_updated_at_on_projects.rb

@@ -0,0 +1,15 @@
+class AddIndexToLastRepositoryUpdatedAtOnProjects < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index(:projects, :last_repository_updated_at)
+  end
+
+  def down
+    remove_concurrent_index(:projects, :last_repository_updated_at) if index_exists?(:projects, :last_repository_updated_at)
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20170503004125) do
+ActiveRecord::Schema.define(version: 20170503004425) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -980,6 +980,7 @@ ActiveRecord::Schema.define(version: 20170503004125) do
   add_index "projects", ["description"], name: "index_projects_on_description_trigram", using: :gin, opclasses: {"description"=>"gin_trgm_ops"}
   add_index "projects", ["last_activity_at"], name: "index_projects_on_last_activity_at", using: :btree
   add_index "projects", ["last_repository_check_failed"], name: "index_projects_on_last_repository_check_failed", using: :btree
+  add_index "projects", ["last_repository_updated_at"], name: "index_projects_on_last_repository_updated_at", using: :btree
   add_index "projects", ["name"], name: "index_projects_on_name_trigram", using: :gin, opclasses: {"name"=>"gin_trgm_ops"}
   add_index "projects", ["namespace_id"], name: "index_projects_on_namespace_id", using: :btree
   add_index "projects", ["path"], name: "index_projects_on_path", using: :btree