1 files changed, 26 insertions, 0 deletions
diff --git a/db/migrate/20200629134747_add_extra_index_to_label_links.rb b/db/migrate/20200629134747_add_extra_index_to_label_links.rb
new file mode 100644
index 00000000000..e2066a1db42
--- /dev/null
+++ b/db/migrate/20200629134747_add_extra_index_to_label_links.rb
@@ -0,0 +1,26 @@
+# frozen_string_literal: true
+
+class AddExtraIndexToLabelLinks < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  INDEX_COVERING_ALL_COLUMNS = 'index_on_label_links_all_columns'
+  INDEX_TO_REPLACE = 'index_label_links_on_label_id'
+  NEW_INDEX = 'index_label_links_on_label_id_and_target_type'
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :label_links, [:target_id, :label_id, :target_type], name: INDEX_COVERING_ALL_COLUMNS
+
+    add_concurrent_index :label_links, [:label_id, :target_type], name: NEW_INDEX
+    remove_concurrent_index_by_name(:label_links, INDEX_TO_REPLACE)
+  end
+
+  def down
+    remove_concurrent_index_by_name(:label_links, INDEX_COVERING_ALL_COLUMNS)
+
+    add_concurrent_index(:label_links, :label_id, name: INDEX_TO_REPLACE)
+    remove_concurrent_index_by_name(:label_links, NEW_INDEX)
+  end
+end