Add index for ci_builds that makes shared runners query to run 50x faster.

1 files changed, 17 insertions, 0 deletions

diff --git a/db/migrate/20170121123724_add_index_to_ci_builds_for_status_runner_id_and_type.rb b/db/migrate/20170121123724_add_index_to_ci_builds_for_status_runner_id_and_type.rb
new file mode 100644
index 00000000000..4ea953f2b78
--- /dev/null
+++ b/db/migrate/20170121123724_add_index_to_ci_builds_for_status_runner_id_and_type.rb
@@ -0,0 +1,17 @@
+class AddIndexToCiBuildsForStatusRunnerIdAndType < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :ci_builds, [:status, :type, :runner_id]
+  end
+
+  def down
+    if index_exists?(:ci_builds, [:status, :type, :runner_id])
+      remove_index :ci_builds, column: [:status, :type, :runner_id]
+    end
+  end
+end