From 91c971bf987824df0e066c20ac341bb5e7485e95 Mon Sep 17 00:00:00 2001
From: Yorick Peterse <yorickpeterse@gmail.com>
Date: Thu, 4 May 2017 20:43:46 +0200
Subject: Index project_group_links.group_id

This column is used when refreshing authorizations and without the
index leads to a sequence scan being performed on this table.
---
 ...04182103_add_index_project_group_links_group_id.rb | 19 +++++++++++++++++++
 db/schema.rb                                          |  2 ++
 2 files changed, 21 insertions(+)
 create mode 100644 db/migrate/20170504182103_add_index_project_group_links_group_id.rb

diff --git a/db/migrate/20170504182103_add_index_project_group_links_group_id.rb b/db/migrate/20170504182103_add_index_project_group_links_group_id.rb
new file mode 100644
index 00000000000..62bf641daa6
--- /dev/null
+++ b/db/migrate/20170504182103_add_index_project_group_links_group_id.rb
@@ -0,0 +1,19 @@
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddIndexProjectGroupLinksGroupId < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :project_group_links, :group_id
+  end
+
+  def down
+    remove_concurrent_index :project_group_links, :group_id
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
index 9773203e9cd..2567dda0edc 100644
--- a/db/schema.rb
+++ b/db/schema.rb
@@ -925,6 +925,8 @@ ActiveRecord::Schema.define(version: 20170508190732) do
     t.date "expires_at"
   end
 
+  add_index "project_group_links", ["group_id"], name: "index_project_group_links_on_group_id", using: :btree
+
   create_table "project_import_data", force: :cascade do |t|
     t.integer "project_id"
     t.text "data"
-- 
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