add trigram database index on tags

1 files changed, 18 insertions, 0 deletions

diff --git a/db/migrate/20190206193120_add_index_to_tags.rb b/db/migrate/20190206193120_add_index_to_tags.rb
new file mode 100644
index 00000000000..5257ebba003
--- /dev/null
+++ b/db/migrate/20190206193120_add_index_to_tags.rb
@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+class AddIndexToTags < ActiveRecord::Migration[5.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  INDEX_NAME = 'index_tags_on_name_trigram'
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :tags, :name, name: INDEX_NAME, using: :gin, opclasses: { name: :gin_trgm_ops }
+  end
+
+  def down
+    remove_concurrent_index_by_name(:tags, INDEX_NAME)
+  end
+end