Index redirect_routes path for LIKE

db/migrate/20170503185032_index_redirect_routes_path_for_like.rb

+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class IndexRedirectRoutesPathForLike < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  # Set this constant to true if this migration requires downtime.
+  DOWNTIME = false
+
+  INDEX_NAME = 'index_redirect_routes_on_path_text_pattern_ops'
+
+  disable_ddl_transaction!
+
+  def up
+    return unless Gitlab::Database.postgresql?
+
+    unless index_exists?(:redirect_routes, :path, name: INDEX_NAME)
+      execute("CREATE INDEX CONCURRENTLY #{INDEX_NAME} ON redirect_routes (path varchar_pattern_ops);")
+    end
+  end
+
+  def down
+    return unless Gitlab::Database.postgresql?
+
+    if index_exists?(:redirect_routes, :path, name: INDEX_NAME)
+      execute("DROP INDEX CONCURRENTLY #{INDEX_NAME};")
+    end
+  end
+end

db/schema.rb

@@ -1049,6 +1049,7 @@ ActiveRecord::Schema.define(version: 20170504102911) do
   end
 
   add_index "redirect_routes", ["path"], name: "index_redirect_routes_on_path", unique: true, using: :btree
+  add_index "redirect_routes", ["path"], name: "index_redirect_routes_on_path_text_pattern_ops", using: :btree, opclasses: {"path"=>"varchar_pattern_ops"}
   add_index "redirect_routes", ["source_type", "source_id"], name: "index_redirect_routes_on_source_type_and_source_id", using: :btree
 
   create_table "releases", force: :cascade do |t|

lib/tasks/migrate/setup_postgresql.rake

@@ -11,4 +11,5 @@ task setup_postgresql: :environment do
   AddUsersLowerUsernameEmailIndexes.new.up
   AddLowerPathIndexToRoutes.new.up
   IndexRoutesPathForLike.new.up
+  IndexRedirectRoutesPathForLike.new.up
 end