1 files changed, 18 insertions, 0 deletions
diff --git a/db/migrate/20171207185153_add_merge_request_state_index.rb b/db/migrate/20171207185153_add_merge_request_state_index.rb
new file mode 100644
index 00000000000..72f846c5c38
--- /dev/null
+++ b/db/migrate/20171207185153_add_merge_request_state_index.rb
@@ -0,0 +1,18 @@
+class AddMergeRequestStateIndex < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :merge_requests, [:source_project_id, :source_branch],
+                         where: "state = 'opened'",
+                         name: 'index_merge_requests_on_source_project_and_branch_state_opened'
+  end
+
+  def down
+    remove_concurrent_index_by_name :merge_requests,
+                                    'index_merge_requests_on_source_project_and_branch_state_opened'
+  end
+end