Add index on invite-email to members

changelogs/unreleased/62685-add-index-invite-email-to-members.yml

+---
+title: Add index on invite_email for members
+merge_request: 29428
+author:
+type: performance

db/migrate/20190610142825_add_index_to_members_invite_email.rb

+# frozen_string_literal: true
+
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddIndexToMembersInviteEmail < ActiveRecord::Migration[5.1]
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :members, [:invite_email]
+  end
+
+  def down
+    remove_concurrent_index :members, [:invite_email]
+  end
+end

db/schema.rb

@@ -1848,6 +1848,7 @@ ActiveRecord::Schema.define(version: 20190611161641) do
     t.boolean "ldap", default: false, null: false
     t.boolean "override", default: false, null: false
     t.index ["access_level"], name: "index_members_on_access_level", using: :btree
+    t.index ["invite_email"], name: "index_members_on_invite_email", using: :btree
     t.index ["invite_token"], name: "index_members_on_invite_token", unique: true, using: :btree
     t.index ["requested_at"], name: "index_members_on_requested_at", using: :btree
     t.index ["source_id", "source_type"], name: "index_members_on_source_id_and_source_type", using: :btree