Index runners by active state

db/migrate/20220104174445_add_ci_runners_index_on_active_state.rb

+# frozen_string_literal: true
+
+class AddCiRunnersIndexOnActiveState < Gitlab::Database::Migration[1.0]
+  disable_ddl_transaction!
+
+  INDEX_NAME = 'index_ci_runners_on_active'
+
+  def up
+    add_concurrent_index :ci_runners, [:active, :id], name: INDEX_NAME
+  end
+
+  def down
+    remove_concurrent_index_by_name :ci_runners, INDEX_NAME
+  end
+end

db/schema_migrations/20220104174445

+5e5e41ee4c8dc9c3fe791470862d15b8d213fcc931ef8b80937bdb5f5db20aed
\ No newline at end of file

db/structure.sql

@@ -25591,6 +25591,8 @@ CREATE INDEX index_ci_runner_projects_on_project_id ON ci_runner_projects USING
 
 CREATE INDEX index_ci_runner_projects_on_runner_id ON ci_runner_projects USING btree (runner_id);
 
+CREATE INDEX index_ci_runners_on_active ON ci_runners USING btree (active, id);
+
 CREATE INDEX index_ci_runners_on_contacted_at_and_id_desc ON ci_runners USING btree (contacted_at, id DESC);
 
 CREATE INDEX index_ci_runners_on_contacted_at_and_id_where_inactive ON ci_runners USING btree (contacted_at DESC, id DESC) WHERE (active = false);