From 1dec74808cca3d78c904f645659384b525c72337 Mon Sep 17 00:00:00 2001
From: Thong Kuah <tkuah@gitlab.com>
Date: Tue, 20 Aug 2019 01:17:28 +1200
Subject: Add index to improve query performance

For Environment.deployed_to_cluster
---
 changelogs/unreleased/cluster_deployments.yml           |  5 +++++
 ...819131155_add_cluster_status_index_to_deployments.rb | 17 +++++++++++++++++
 db/schema.rb                                            |  1 +
 3 files changed, 23 insertions(+)
 create mode 100644 changelogs/unreleased/cluster_deployments.yml
 create mode 100644 db/migrate/20190819131155_add_cluster_status_index_to_deployments.rb

diff --git a/changelogs/unreleased/cluster_deployments.yml b/changelogs/unreleased/cluster_deployments.yml
new file mode 100644
index 00000000000..d854d16ea72
--- /dev/null
+++ b/changelogs/unreleased/cluster_deployments.yml
@@ -0,0 +1,5 @@
+---
+title: Add index to improve group cluster deployments query performance
+merge_request: 31988
+author:
+type: other
diff --git a/db/migrate/20190819131155_add_cluster_status_index_to_deployments.rb b/db/migrate/20190819131155_add_cluster_status_index_to_deployments.rb
new file mode 100644
index 00000000000..bfa91e33558
--- /dev/null
+++ b/db/migrate/20190819131155_add_cluster_status_index_to_deployments.rb
@@ -0,0 +1,17 @@
+# frozen_string_literal: true
+
+class AddClusterStatusIndexToDeployments < ActiveRecord::Migration[5.2]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :deployments, [:cluster_id, :status]
+  end
+
+  def down
+    remove_concurrent_index :deployments, [:cluster_id, :status]
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 454ea939a6f..14029486dfe 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -1146,6 +1146,7 @@ ActiveRecord::Schema.define(version: 2019_08_28_083843) do
     t.integer "status", limit: 2, null: false
     t.datetime_with_timezone "finished_at"
     t.integer "cluster_id"
+    t.index ["cluster_id", "status"], name: "index_deployments_on_cluster_id_and_status"
     t.index ["cluster_id"], name: "index_deployments_on_cluster_id"
     t.index ["created_at"], name: "index_deployments_on_created_at"
     t.index ["deployable_type", "deployable_id"], name: "index_deployments_on_deployable_type_and_deployable_id"
-- 
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