Commit 3f0054a8 authored by Stan Hu's avatar Stan Hu

Add unique index for note_id to system note metadata table

In issue 1, the sequential scan was taking 250+ ms.
parent a9da3743
title: Add unique index for notes_id to system note metadata table
class AddIndexToSystemNoteMetadata < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
# Set this constant to true if this migration requires downtime.
DOWNTIME = false
def up
# MySQL automatically creates an index on a foreign-key constraint; PostgreSQL does not
add_concurrent_index :system_note_metadata, :note_id, unique: true if Gitlab::Database.postgresql?
def down
remove_concurrent_index :system_note_metadata, :note_id, unique: true if Gitlab::Database.postgresql?
......@@ -11,7 +11,7 @@
# It's strongly recommended that you check this file into your version control system.
ActiveRecord::Schema.define(version: 20170418103908) do
ActiveRecord::Schema.define(version: 20170419001229) do
# These are extensions that must be enabled in order to support this database
enable_extension "plpgsql"
......@@ -1140,6 +1140,8 @@ ActiveRecord::Schema.define(version: 20170418103908) do
t.datetime "updated_at", null: false
add_index "system_note_metadata", ["note_id"], name: "index_system_note_metadata_on_note_id", unique: true, using: :btree
create_table "taggings", force: :cascade do |t|
t.integer "tag_id"
t.integer "taggable_id"
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