add an index to the ghost column

db/migrate/20170313213916_add_index_to_user_ghost.rb

+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddIndexToUserGhost < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  # When a migration requires downtime you **must** uncomment the following
+  # constant and define a short and easy to understand explanation as to why the
+  # migration requires downtime.
+  # DOWNTIME_REASON = ''
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :users, :ghost
+  end
+
+  def down
+    remove_index :users, :ghost
+  end
+end

db/schema.rb

@@ -61,7 +61,6 @@ ActiveRecord::Schema.define(version: 20170315194013) do
     t.boolean "shared_runners_enabled", default: true, null: false
     t.integer "max_artifacts_size", default: 100, null: false
     t.string "runners_registration_token"
-    t.integer "max_pages_size", default: 100, null: false
     t.boolean "require_two_factor_authentication", default: false
     t.integer "two_factor_grace_period", default: 48
     t.boolean "metrics_enabled", default: false
@@ -111,6 +110,7 @@ ActiveRecord::Schema.define(version: 20170315194013) do
     t.string "plantuml_url"
     t.boolean "plantuml_enabled"
     t.integer "terminal_max_session_time", default: 0, null: false
+    t.integer "max_pages_size", default: 100, null: false
     t.string "default_artifacts_expire_in", default: "0", null: false
     t.integer "unique_ips_limit_per_user"
     t.integer "unique_ips_limit_time_window"
@@ -688,8 +688,8 @@ ActiveRecord::Schema.define(version: 20170315194013) do
     t.integer "visibility_level", default: 20, null: false
     t.boolean "request_access_enabled", default: false, null: false
     t.datetime "deleted_at"
-    t.text "description_html"
     t.boolean "lfs_enabled"
+    t.text "description_html"
     t.integer "parent_id"
   end
 
@@ -1231,8 +1231,8 @@ ActiveRecord::Schema.define(version: 20170315194013) do
     t.datetime "otp_grace_period_started_at"
     t.boolean "ldap_email", default: false, null: false
     t.boolean "external", default: false
-    t.string "incoming_email_token"
     t.string "organization"
+    t.string "incoming_email_token"
     t.boolean "authorized_projects_populated"
     t.boolean "ghost"
   end
@@ -1244,6 +1244,7 @@ ActiveRecord::Schema.define(version: 20170315194013) do
   add_index "users", ["current_sign_in_at"], name: "index_users_on_current_sign_in_at", using: :btree
   add_index "users", ["email"], name: "index_users_on_email", unique: true, using: :btree
   add_index "users", ["email"], name: "index_users_on_email_trigram", using: :gin, opclasses: {"email"=>"gin_trgm_ops"}
+  add_index "users", ["ghost"], name: "index_users_on_ghost", using: :btree
   add_index "users", ["incoming_email_token"], name: "index_users_on_incoming_email_token", using: :btree
   add_index "users", ["name"], name: "index_users_on_name", using: :btree
   add_index "users", ["name"], name: "index_users_on_name_trigram", using: :gin, opclasses: {"name"=>"gin_trgm_ops"}